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The Butterfly Theorem
作者：
Lamberto Lamberti
http://www.cut-the-knot.org/pythagoras/Butterfly.shtml
GeoGebra
最新資源
Building Trapezoids with Set Areas
functionartculture
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探索資源
recognise trigonometric ratios
Projectile Motion: Variable Height & Velocity
STUD Draw Activity DGEO 1.1
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反射
正切線或正切
梯形
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定積分