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Anne Kahnt

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Vorfreude auf #sundb  

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Am Samstag in Berlin: Der Mathe-Familien-Tag.

Nach dem erfolgreichen Start im vergangenen Jahr ist der Mathe-Familien-Tag 2015 größer, spannender und mathematischer.

Am Samstag, 12. September, 14 bis 18 Uhr im Schulgarten Moabit, Birkenstraße 35, 10551 Berlin. Eintritt frei!

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Path of the center of the incircle, as the triangle is shuffled around its circumcircle 

In geometry, the incircle (or inscribed circle) of a triangle is the largest circle contained in the triangle; it touches (is tangent to) the three sides. The center of the incircle is called the triangle's incenter.

The circumcircle of a triangle is a triangle's circumscribed circle, i.e., the unique circle that passes through each of the triangle's three vertices. The center of the circumcircle is called the circumcenter.

Any triangle has both the incircle and the circumcircle.

Considered this, Matthew Henderson created the suggestive animation below.

He writes:

For any triangle, you can draw a circle that fits perfectly inside (the incircle) and also one that connects all its corners (the circumcircle). This shows the path of the center of the incircle, as a triangle is shuffled around its circumcircle. 

Animation source>>

#geometry #animation #triangle #circumcircle #incircle
Animated Photo

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Great summarization by +John Cook about life lessons we can learn from differential equations. Comes with a great photo :)


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Fundstück des Tages: Hund, Stöckchen, Brücke – Mathematik:

(gefunden auf Reddit)

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Have you heard about the #mathphoto15  challenge on Twitter? Send in your picture(s) concering the weekly topic. Right now it's #tiles  and #tessellations  

Check out the current pictures:

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Visualisation: Oloid – Cube by P. Schatz
Great visualisation of the connection between Oloid and the "flexible" Cube – this connection was discovered by Paul Schatz.

We have two version of the wooden Oloid online:

Video here:

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