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GeoGebra
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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
New Resources
判斷球體
Earth with coastline
美國國旗 (Codex 版)
算柱 (兩位數)
畫出對稱圖形
Discover Resources
百分數：買賣問題（Java 版）
向量分解：解聯立
some circles
錐體的橫截面
電子幾何條的副本
随机模拟实验（撒豆子估算π）的副本
Discover Topics
Angles
Solids or 3D Shapes
Quadrilaterals
Arithmetic Mean
Functions