cool~

### TECHNICS

Shared publicly -MATHEMATICS • GEOMETRY

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**Which Figure is drawn by the top of this stick ?**———————————————————————

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425 comments

dileep sukumaran

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7

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oval

Ehsan Wadood

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3

very niceeeeeeeeeeeeeee

an ellipse

me hipnotiza

Karan Rajbhar

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10

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circle

We now have dry-erase marker on the monitor

Samuel Muiruri

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how do you know the answer>

circle

David Sweetser

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Square

Rom n Ric

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8

An ellipse

+David Sweetser maybe squared circle ?

superb

Ganesh Nayak

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ellipse

Ehsan Wadood

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circle I think!!!!!!!!!!!!!!

it's a Frocktogon

A circle...

Eine Elypse

Mattes Moormann

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looks like a tower!

arshath zameek

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is this even possible?

Vladislav Kazak

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Definitely CIRCLE. Not citcle,I was wrong- VID_20120208_185043.mp4

Arno Barnard

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Ellipse.

Ahmad Sendos

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Ellipse

at an angle, an ellipse - from birds eye, a Circle

Steven Murphy

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nothing, it doesn't have anything to draw with. but i would guess an oval.

a circle

TRIANGLE !!!

partha sarathi Sahoo

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its elypse.................>>>>>>>>>>>>

the mechanism is called "ELLIPTICAL TRAMMEL"

the mechanism is called "ELLIPTICAL TRAMMEL"

its a COOL mechanism

arshath zameek

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this isnt a circle for sure. this is an ellipse

+jose heredia yes

Mikie Mike

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0

arshath zameek

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the radius changes with time. how can this be a circle?

Ellipse

circle ? O.o

Pankaj Dhande

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Ellipse

Bruno Škvorc

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Square

Kirk Reed

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Circle. Most likely an optical illusion.

Magnetic-self

Jens Hausherr

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Ellipse.

Hussein Ahmed

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Ellipse

genial

ram kumar

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hexagon or octogan

Atif Mehmood

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There is nothing on it to draw, no page either.. lol

A Kropp

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ok.. ellipse

eclipse

සසිත වත්මල්

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2D object :)

ellipse

Conan Oman

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Ellipse

شكل بيضاوي ^_^

شكل بيضاوي ^_^

Omi Shewale

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thats right its ellipse

Alzir Fraga

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Of course it's an ellipse

i think it's a circle

Rock Fredrick

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it's an ellipse

Ellipse

as +partha sarathi Sahoo indicated, it's a Trammel, as can be clearly seen at Wikipedia

http://en.wikipedia.org/wiki/Trammel_of_Archimedes

http://en.wikipedia.org/wiki/Trammel_of_Archimedes

eres un fenomeno me encanta ese sistema

Translate

Jitin Dominic

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ellipse

ploygon

ellipse

ya ellipse

ellipse

Mikel Roa

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Rectangle?

formato de ovo

Translate

Circle

Its an ellipse....!

circle as major nd minor axis are f same length

Ozair Riyaz

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ellipse

Nicholas Smith

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an ellipse?

Vince Caregnato

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I bet it's a giraffe

Melina Vidal

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ovalo?

major axis is along the stick when it is downward parallal to the groove and minor axis along the stick when it is horizontal...parallal to that groove. +hitesh bhatt

circle<ellipse is a special case of circle>

circle

A cylinder ??? :D :P

Aryama Mandal

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Awasam.......

its an ellipse

its an ellipse

Muy bueno!!! es una elipse!!!!

Translate

Ellipse, or oval

circle

Ellipse

elliptical...

circle....

elypsis

Umair Tanveer

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elliptical

Tauseeq Raja

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Ellipse

Ellipse

oval

Its a circle...

Ohhhhhhhhhhhhhhhh

Christian W.

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+Peter Moore The question say " What figure ..." Not line. You see what you see.

Piseth Tep

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ecliptical

eclipse

que yulo

great

elipse

Translate

Cirlce

Trammel of Archimedes - ellipse

lol @ circle

pranay kumar

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Ellipse

more importantly, lol @ square

curioso

Clint Fix

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It is an ellipse. If it were a circle, it would have a static center point. The pivot of the arm (the part moving near vertically in the animation) that would draw is moving in the North/South direction, but is static in the East/West. There is no way this contraption could draw a circle. Here's more explanation: http://en.wikipedia.org/wiki/Trammel_of_Archimedes

manu tewari

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Ellipse

Peter boege

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i made one found it in a old Mechanix Illustrated from September 1961

they called it a RECIPROCATING WATCHAMAJINGER

they called it a RECIPROCATING WATCHAMAJINGER

TECHNICS

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as i remember from school, Circle is Ellipse too...

with focuses in...

with focuses in...

now will sum1 tell me wat is it?

ellipse

To Nidhiya.it is ellipse.it is like a circle.but in ovel shape

!!!!!!!!!!!!!!

ellipse

Onise Sharia

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It is ellipse. You can write its equation explicitly. If the length of the stick is L and the side of the square is 2*a, than equation of the figure it draws is x^2/(L-a)^2+y^2/L^2=1. Vertical and horizontal movements are not symmetric

its an ellipse

ellipse

Kentucky do nothing! FTW. It draws an ellipse.

ellipse

0

An oval (ellipse)

sumthing lyk an ellipse...i guess

No figure is being drawn by the top of that stick. Isn't it obvious?

An ellipse is the locus of all points of the plane whose distances to two fixed points add to the same constant.

oval

Vladislav Kazak

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Correct answer is here: VID_20120208_185043.mp4

an ellipse...

Nico Rock Rock

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a bunny...

oval/ ellipse

Frank Flaherty

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None, there is no pencil attached to the arm!! But if there were I reckon Oval.

It is a circle, it looks like an ellipse because it is an isometric view.

Correction: It is an ellipse formed by an Archimides Trammel as noted by partha sarathi Sahoo

Correction: It is an ellipse formed by an Archimides Trammel as noted by partha sarathi Sahoo

I first thought an oval just by following the tip but on second thoughts the two pivots seem equal which points to a circle?

circle, all sides of the square seem to be equal.

An eliptically circular triangle. Previously undiscovered in this universe but very common in all others. Or so they lead me to believe..........:-P

thts ellipse

star

none =)

Chris Terrell

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Perfect circle!.

good

circle

ellipse.......

I Think circle

Michael Jasinski

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I actually used to have one of these. I called it a bullshit grinder!

oval mam

I have one of these. We call it a "do-nothing".

AN ELIPSE

Translate

9c......

ellipse if L and B are different , circle L=B

i get confuzed,,,, but i feel it s cross

Assuming the block the arm is sliding on is actually square and not an optical illusion then an Ellipse. The pointing arm is at its longest when the middle block slides from side to side.

oval........

ellipse

oval....Bi very nice trick i like it

circle, the moving objects in the square move the same amount.

Kevin McClain

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It is an Ellipse. If it were a circle, the stick would have to be connected to the moving shuttles at regular intervals (i.e.- the 1/3 and 2/3 point). That way, the motion of each shuttle would affect the stick evenly. However, because of the necessity of equal motion between the shuttles, the shuttles would become locked, and the stick would not be able to make a full circuit! As it stands, one shuttle exerts a much greater influence over the direction of the stick, and they cannot collide. This is an animation of the Trammel of Archipedes, which draws an Ellipse.

Circle

so its an ellipse. ALRIGHT@

ellipse

What stick?

must be a "somebody elses problem" perception filter on it...

must be a "somebody elses problem" perception filter on it...

a smiley face.

Ну это вообще классика

Translate

I have a wallet

I had a toy called a "does nothing" It was exactly this.

Egg

krug

An Oval

An Oval Egg

niceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Vladislav Kazak

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Correct answer here- VID_20120208_185043.mp4

an oval

obviously an oval but it would be interestin to see the outline defined! math is so intriguing, its like a giant puzzle!!!!

i hope one day i will be able to do geometry too. a journey takes one step at a time. ^_^

i hope one day i will be able to do geometry too. a journey takes one step at a time. ^_^

its oval shape

The top of the stick is only going left to right

Ellipse

Its an Archimedes ellipsograph.

Aditya Upadhyaya

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an ellipse......

SKECHUP ANIMATION

Translate

Subhankar Ghosh

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ellipse

wow, watch those flashbacks, dude!

an ellipse

Koooool imagination

Koooool imagination

ellipse

Bobby Pineda

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penis shape

A straight line.

has no one else understood this???????

figure as in number it's 0

figure as in number it's 0

circle

circle

Ellipse

ellipse...........

ellipse, like a parabolic sort of a cam in a car?

altough the logic says a circle, it seems more an elipse.

NICE!!

thats really cool

椭圆

Wow! I actually HAVE one of these made of wood!

It's a paralirclegon

Mast

sahi hai.....

its an eclipse

fuck it

Sandwich

elipse...

Translate

mango shape. .

PENTAGRAM

i wonder.......

it is pretty nice job .i think its a circle

owsome budy

Circle

hi

Well technically an ellipse since we aren't given the length of the x and y axis. And since a circle is a special case of an ellipse where x=y then ellipse is the most correct answer.

rajan n

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Egg

Ellipse

An Ellipse

UNa elipese

Translate

its making us wonder for sure!

ellipse - I remember my grandfather giving me this toy as a gift, but with the stipulation that I figure out what it was!

Eye

Oval

circle wat up people

circulo

ya an ellipse...

square

It is Oval..

oval

Ellipse

circle

offcourse Ellipse ...

A perfect circle

Oval

figure 8

imho Circle

heart

niceeeeeeeeeeee

Jennifer Carson

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oval

ellipse, i guess.

elipse

Translate

Danny Cruz

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Makes you think it's an oval, but it's a circle.

i love monkeys

ellipse..!

Ellipse ... there is not static centre point

Oval?

TJ Edwards

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not a elispe or circle becase this was done on a computer and pixels are square so it is technicly imposibel to make a perfect circle on a computer and becase of the stop of movment of the 2 yellow boxes that control the movment of the stick becase of them stoping movement there will be a slight corner so its a very very small sections so it wouldnt be a circle or elipse in life now how many sides there are I have no clue becase im only 13 and i dont have that technology on this computer to slow down the animation to see how many there are.

I'm amazed at how many people think it's a circle. Seems it's true that not everyone has great 3D interpretation :P

Clearly, an ellipse...

wow! it is a good puzzle.I think stick makes a circle.

an ellipse?

Tell me about it !!

oval

Ryne Bell

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ellipse

oval egg shape?

nice :)

eng

and to add on to that i forgot to mention that becase of the slowing movement to the boxes the stick slows down like a racecar driver slows down to turn even though there is banking if the banking was steeper they might not need to slow down but then they might just slide right (or left :P) off

ellipse

cool buddy...!!!!!!!! it's an oval shape

elipse

Translate

awesome

amazing but the figure is acircle

soo cool

ellipse, with major axis diamater = semi-axis diamater + length of square of box.

ellipse

niyati trivedi

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Elliptical..!!

A Cannon.

so nice

ellipse! really cool

elipse

Translate

ellipse

an oval

ellipse.......

egg like shape defenitely .

Circle

CIRCLE

Running track shape or "capsule shape" straight on the sides

Surely, its Ellipse ==>> whose plane is not parallel to the axis, base, or generatrix of the intersected cone

pedro eustache

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... or rather, an Ellipse [oval]?

circle

ellipse

an egg?

Zero

its an ellipse...:)

squircle!

an oval

Itz an Eclipse ..................

Harish MC Uneek

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oval ??

All I can figure out is an oval

een ovaal?

Harish MC Uneek

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it seems like an ellipse to me !

circle

an oval

an ellipse

eggggggggggggggggggggg

It's an ellipse, search for "Archimedes Trammel"

Oval... Notice the difference in the distance to the squared base. Farther on the top and bottom, closer on the sides.

Zach Newton

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It's a circle but the angle at which your looking at it makes you think it's an ellipse. If it were an ellipse, the shuttles would have to move different distances but as the distances are the same, the lines drawn is the same width in all directions. This is a textbook circle equation made into a physical representation. I'm just going to give an example using a made up radii.

x^2 + y^2 = 16

x^2 + y^2 = 16

Skittles Ali

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It's an ellipse

0

science

Its an ellipse, and (since a circle is an ellipse) I will go a step further and say it is not a circle. Think about how far the tip of the board is away from the center of the contraption. You will notice that the two bricks are on the same side of the contraption when the stick is vertical extending the sticks tip a full stick length away from the center, but when the stick is horizontal, the two bricks are on the opposite side of the contraption as the sticks tip, extending the tip only half of the sticks length away from the center.

Alanis Morrissette?

circle.......

cool

Kevin McClain

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+Zachary Newton - That would only be accurate if the stick was connected at equal points to the shuttles. It isn't, meaning that the shuttles affect the stick in different proportions. So, you have to multiply your x and y times the percentage they are attached to the stick for a proper equation. Also, if they were attached to the stick equally (i.e. the 1/3 and 2/3 point), the shuttles would collide in the center, as they would be moving equally. This is a Trammel of Archimedes, and draws an Ellipse.

ellipse

an ellipse. a north-west south-east one

ellipse

ellipse

ellipse?

oval

oval

Ellipse

ellipse

Mickey Mouse?

I said ellipse also but because of the pivot point moving up and down - the one attached to the end doesn't really affect it that I can see.

double pear-shaped cam XD

if it was actually drawing I would say an ellipse

oval

its cool dude

looke like an ocal to me

Tiago Jorge

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**draw**|drô|

verb ( past drew |droō|; past part. drawn |drôn|) [ trans. ]

- produce (a picture or diagram) by making lines and marks.

I do not see any marks... lines or whatever

So i'm sorry to disappoint you all but this thing doesn't draw anything...

**you have all been fooled**once again

ellipse

Oh prof you did it.

Not a circle, an ellipse. If the stick was rotating around a fixed point, it would draw a circle.

The other end of the stick is making a rectangle!

i guess everybody is guessing wild !!! :)

circle?

A circle

Puneet Soni

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it is an ellipse made by ellipsograph

It's an circle !

ellipsographs are the new black... everyone should have them

Ellipse..............

Dawn Cicero

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ellipes

This is like the 3rd time I've seen this same gif and posed question in 'what's hot'....I feel like I'm in the movie groundhog's day.

Similar subject for interested parties: http://mathworld.wolfram.com/Hypocycloid.html

Circle

+Tiago Jorge What would I use it for? Just to draw ellipses?

Oval

ellipse

a frog

An Oval.. shape

I will see your circle and raise you an ellipse!

An Ellipse...0

oval

Circle

Oval!!! ^_^

circle

An oval. Come on guys!!!

convex hull of two circles; 2d capsule shape

ellipse :)

Circle (in addition to sine ans cosine)

ellipse

ellipse

a oval

ellipse

nice method

fantastic

elipse this is fantastic

cross or plus sign

the moon

ellipse

Ellipse

Answer here- http://youtu.be/VKNRXukNfZU

I put stickies on the screen, and it is clearly drawing an oval (or an ellipse) however the line drawn on the screen is a different oval than the one that would be drawn if we looked at the machine from above. And if we were treated to a true sense of perspective, we would clearly be working with an oval and not an ellipse.

itsanoval

The square root of the isosceles image is equal to the triangle on a raccoons ass. But just encase, don't put you lips on it, my Daddy used to have one of these things.

Scott Lowe

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Since a lot of people seem to be confused, and giving the wrong answer...

There are a couple of ways of thinking about this to confirm you have the correct answer.

First, notice that the end is a fixed distance from the middle pivot, and in the frame of reference of the middle pivot, the tip moves in a circle. But the middle pivot is actually moving up and down with the motion of the rotation. So it's a stretched circle - an ellipse.

Second, the tip is a fixed distance from the end pivot. When the tip is top-left, the other end is in the centre of the + (close as it can be); when the tip is bottom-left, the other end is as far away as it can be; etc. The constraint on the other pivot forces an ellipse (again).

If you're still confused, google "ellipsograph".

There are a couple of ways of thinking about this to confirm you have the correct answer.

First, notice that the end is a fixed distance from the middle pivot, and in the frame of reference of the middle pivot, the tip moves in a circle. But the middle pivot is actually moving up and down with the motion of the rotation. So it's a stretched circle - an ellipse.

Second, the tip is a fixed distance from the end pivot. When the tip is top-left, the other end is in the centre of the + (close as it can be); when the tip is bottom-left, the other end is as far away as it can be; etc. The constraint on the other pivot forces an ellipse (again).

If you're still confused, google "ellipsograph".

Circle.

your mom

+Scott Lowe Now you have turned it clear to understand. Thank you.

Rahul Banerjee

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ellipse

Oval

Gotta be an ellipse..

Tim Dorais

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Circle if the base is square, Ellipse if the base is a rectangle.

EDIT: Totally take it back. The placement of the bar differs(by half the length of the square) depending on whether it's vertical or horizontal. It's an ellipse.

EDIT: Totally take it back. The placement of the bar differs(by half the length of the square) depending on whether it's vertical or horizontal. It's an ellipse.

un circulo

Translate

you know an eight. . . but just erase where the lines connected. . . a small piece of it now . . . and then reconnect them but make sure there is nothing in the middle, kind of like a circle that is bent in the middle... Peace

Its an easter egg. happy easter everyone VID_20120208_185043.mp4

Jesus

Straight Line.

ellipse

square

its a square with rounded corners

you have to think from a top down perspective

you have to think from a top down perspective

it's table !!!

good

a circle

Ellipse...

ellipse

Ellipse

circle :-)

ellipse

Zvonimir Bandic

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ELLIPSE! It is definitively an ellipse. If the length of the stick between two pivots is b, and if the total length of the stick is (b+c), then the tip of the stick will draw an ellipse with one axis being equal to c, and the other one to abs(c-b). This is easily provable and seems to be known under several names including "Trammel of Archimedes" etc. Observe that in the case c is very large or if c=b/2, the curve indeeds becomes a circle.

Everyone seems to think its an ellipse - which it approximately is. If you set this up with servo drives driving the blocks, then the acceleration of the drives through each traverse would affect the exact points plotted - it's a particular approximation of an ellipse if we assume that the blocks accelerate smoothly - sinusoidally. You could delberately ramp the accellation so that the speed accross most of the traverse was constant, and your ellipse would be more distorted. The shape drawn is voluptuously beautiful, but it is not a perfect conic section, therefore, not a perfect ellipse. Elegant machinery, indeed. At first I thought irt would trace a Rouloux polygon...disappointed when I realised it wouldn't.

Nice

it is an oval

I am going to build this to find out.

Ellipse

Filip Corbeski

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ellipse

it is not ellipse, nor oval or circle. An amateur is trying to learn animation! lol

circle...

Circle - the radius up and down/left and right is the same therefore its a circle.

satu par

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oval

none. the top of the stick does not actually "draw" anything.

Impressive locus design, an ellipse

its an ellipse

Malorie Carbone

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egg

LOOKS MORE LIKE AN ELLIPSE....

more like a circle to me.

Andy wilcock

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0

Jack Smith

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ellipse

Alajuwon Gordon

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1

0

1

0

1

0

circle

بیضی

Translate

A circle?

i dont know

it is so ra

I agree with Dave. Its an ellipse!!!

CIRCLE!

an X

super!!!

superb

how did you make it? could you plz send me the sizes

Eclipse

ellipse

Harpoon topee

BEAN SHAPE

+TJ Edwards get a life

This confused meh and also amused meh ........... O.O

ellipse

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