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三角函数 的副本
Author:
李东
GeoGebra
New Resources
圓周公式的應用
直線的斜率
科氏力 (Coriolis Force)
讀磅
直線的斜率：水平變化 & 鉛垂變化
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excenter of triangle
畢氏定理完成20170330
Compare areas by cutting shapes Q3
勒洛四面体（拼接法）
【案例】圆柱体内放置一个大球六个小球
Discover Topics
Triangles
Linear Equations
Sphere
Subtraction
Right Triangles