Stream

Join this community to post or comment
 
All squares are rectangles, but not all rectangles are squares.
All squares are rhombuses, but not all rhombuses are squares.
All circles are ellipses, but not all ellipses are circles.
All triangles are triangles :)
12
1
Tim Brzezinski's profile photoPaul Hartzer's profile photoOrs karaf's profile photo
4 comments
 
"Typically": There are outliers, but the most common definition is "exactly one", not "at least one".

We could say the same thing about kites and rhombi (that a rhombus is a special kind of kite), but "kite" is usually defined such that rhombi are not kites.

Wolfram MathWorld is an outlier in that it specifically states that a rhombus is a special kind of kite (http://mathworld.wolfram.com/Kite.html), but is non-committal on a parallelogram being a special kind of trapezoid.

Then again, the same can be said of ellipses and circles: A circle is a degenerate ellipse, a rhombus is a degenerate kite, a parallelogram is a degenerate trapezoid.

However, there is one problematic point in allowing parallelograms to be trapezoids: It complicates the definition of "isosceles trapezoid". If parallelograms are not trapezoids, then "isosceles trapezoid" (which is, taxonomically speaking, more interesting than a trapezoid) can be defined as "a trapezoid with one pair of opposite congruent sides", and has the characteristic that the base angles are congruent. If parallelograms are allowed to be trapezoids, then the definition of "isosceles trapezoid" has to include "a trapezoid with one pair of opposite congruent sides and two pairs of congruent base angles".

We can define terms however we please, but deviating from the standard can create issues elsewhere.
Add a comment...
31
3
Gerhard Fang's profile photoMalsha Kumarasinghe's profile photoHendrik Boom's profile photoStephen CHAN's profile photo
8 comments
 
Whether i'm a genie or cracy?
Add a comment...
 
Life as a math student:

The joy when a term simplified to 1 or 0.
18
2
Landon Azbill's profile photoKenneth Ultimate's profile photoGeorge Virginia's profile photoWould you Believe ?'s profile photo
3 comments
 
One and zero, a blissful feeling
Add a comment...
33
1
Mujahid Khalid's profile photo
Add a comment...
36
2
Harshit Kasera's profile photoSuleiman Ibrahim's profile photoMatthew Torrens's profile photohashem hussen's profile photo
9 comments
 
I ate some pie.
Add a comment...
56
8
Michael R's profile photoSimply Me's profile photoChristopher Sevilla's profile photoLeucoros Alpha's profile photo
21 comments
Add a comment...
33
10
Christopher Andrew Sparks's profile photoTaweechai Maklay's profile photoGildas Cédric Douamba's profile photoPranav Balabhadra's profile photo
14 comments
 
I like the Matrix Action Movies.
Starring is Det aka Determinant who is in love with Miss Inverse.
Add a comment...
 
Jock...
10
Add a comment...
39
4
Patrick Findley's profile photoChun Shen's profile photoDaniel Carvalho's profile photofd gfr's profile photo
19 comments
 
My conversations about it are more like : I say: "so where do parallel lines meet?". Student quotes something he heard :"at infinity". I reply "that's correct they never meet".
"So what's infinity?" "Well, the lines never meet or at forever but that's not really a place."
Add a comment...
56
7
Rithvik S. Ghankot's profile photoCharles Filipponi's profile photoAdam Witkowski's profile photoErik Swiger's profile photo
 
Gay.
Add a comment...
36
10
Fernando Santagata's profile photoDJ Claussen's profile photoasif khan's profile photoryan lee's profile photo
5 comments
Add a comment...
 
qed
60
5
Soham Purohit's profile photoCharles Filipponi's profile photoFatih Yıldız's profile photoLaura Cui's profile photo
2 comments
 
+Matemática? Absolutamente!​ Epic way to end a book! 
Add a comment...
 
Haha. Just kidding 
26
1
Owen Bailey-Waltz's profile photovenkatsai murlidharan's profile photoJosé Carlos Boura's profile photo
3 comments
 
Me doing maths
Wow
Yeah
More of that please
Well i nailed it
That was fun
I should do more
...
Never ending process
Mathematics is the best !!
Add a comment...
97
15
MADHUBABU S's profile photoKároly Kozma's profile photoHerr Dr. Schmidt's profile photoPranav Balabhadra's profile photo
4 comments
 
Same to Latinos. They take binomial nomenclature very simple! 
Add a comment...

Hedia

Jokes  - 
 
and basicslly ur answer is right😁
55
5
William Kwasidev's profile photoKarmesh C's profile photoAlan Joy's profile photoPranav Balabhadra's profile photo
2 comments
 
Haha. Someone, kill me 
Add a comment...

Hedia

Jokes  - 
 
the reason cats stop for a moment before jumping 😂 
79
16
Michal Bester's profile photoHendri Karisma's profile photoRashid Zaynetdinov's profile photoMauro Crociara's profile photo
3 comments
 
They do so to gather momentum
Add a comment...
 
I wonder using Techniques of Complex number, such as conformal transformation and so on, makes me a good artist, doesn't it?
4
Hedia's profile photo
Hedia
 
lolz its make sense...
Add a comment...
 
 
This sentence is a fixed point.
3
Abeid wa Kalume Van's profile photo
 
Fixed point with no magnitude lol
Add a comment...
 
Note to Self:
Never touch a graphing calculator, except in math class.
(I had a sine wave that broke the calculator but I couldn't replicate it)

20
3
Liber Philosophus's profile photoJames Nelson's profile photoDaisy D. Miles Movies's profile photoPaolo Redaelli's profile photo
14 comments
 
Yah lol, you can make some pretty weird stuff.
Add a comment...