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Hoehn's Theorem
Author:
Chenwei Chen
GeoGebra
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sanjiaohanshu
畫出對稱圖形
找出對稱軸
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
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cos, sin 與單位圓
教學－面與面的夾角
triangle
Circle Rule
数线段
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Coordinates
Power Functions
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Subtraction
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