Equilateral Triangle + Semicircle = ? (GoGeometry Action 88)

Tópico:Circuferência, Triângulos equiláteros

Creation of this applet was inspired by a tweet from Antonio Gutierrez (GoGeometry). How can we formally prove what this applet informally illustrates?

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Dividing a 3-digit number by a 1-digit number (1)
Dividing a 2-digit number by a 1-digit number (2)

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Even and Odd Properties of Trig Functions
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