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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
New Resources
第八周作业
直角坐標平面上的旋轉變換
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
兩位數加法
Discover Resources
分數除以分數圖解
推移（y 方向）
龍騰4_1-1習6-1
Angle Sum in a Triangle
三角形外心的位置
Discover Topics
Cosine
Solids or 3D Shapes
Geometric Transformations
Coordinates
Dilation