Cut-the-Knot-Action 13!

作者：Tim Brzezinski

Creation of this applet was inspired by a tweet from Alexander Bogomolny. LARGE points are moveable at any time. How can you formally prove what this applet informally illustrates?

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Proof of angle in a triangle
Math BRO 2
Vertically Opposite Angles and Angles Around a Point
Conics Project
deMoivre's theorem with unit length

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等式
正方形
坐標
對稱
線性函數

Cut-the-Knot-Action 13!

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