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tan(α) tan(β) = ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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球体的体积推导（优化版）
垂直線的斜率
【案例】圆柱体内放置一个大球六个小球
平行線的斜率
多邊形的面積
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lms2702
正三角形堆垛
勾股定理的毕氏证明
表示數線上的位置
撒针估算面积实验
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Triangles
Cube
Tree Diagrams
Polynomial Functions
Arithmetic Mean