An Angle Sum Problem (with a visual solution)

This is a short, animated visual proof showing how to find the sum of angles of a collection of triangles embedded in a square in a particular way.

Have a different solution? Share it in the comments!

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This animation is based on a solution to a problem from an Illinois Section of the MAA student problem competition.

For a static version of this proof, see Roger Nelsen's third "Proof Without Words: Exercises in Visual Thinking" compendium (page 33).

Check out Roger's book on Amazon (affiliate link to follow; I may receive a small commission at no cost to you): https://amzn.to/3M9jzE7

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To learn more about animating with manim, check out:
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