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Internal tangent

Author:jaycheung2016plk

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球體建築師
拼砌四邊形
四邊形的特性
GeoGebra笔记功能体验课件
球体的体积推导（优化版）

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下和與上和
一次函數與斜率
三角形面積公式B1
畢氏定理2
任意角的生成

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Limits
Prism
Sine
Polygons
Subtraction

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