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angles sum of a triangle 2
Author:
LAM YU SANG
GeoGebra
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多邊形的面積
直線的斜率：水平變化 & 鉛垂變化
球体的体积推导
平行線的斜率
祖冲之的期望：内棋与外棋
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大邊對大角
正四面體
winter vacation homework 6
優良作品4(薇如)
两平面夹角
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Circle
Conditional Probability
Differential Calculus
Cosine
Parallelogram