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相似三角形條件 - 三邊成比例
Author:
AaronLau
GeoGebra
New Resources
圓的切線方程
三角函数 的副本
垂直線的斜率
祖冲之的期望：内棋与外棋
直線的斜率：水平變化 & 鉛垂變化
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Elementary school math
兩圓內外公切線
sin(x) 的函數圖形
Testing 20170308
正方体内切球
Discover Topics
Similar Triangles
Constructions
Cuboid
Surface
Translation