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等邊三角形
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陳信均
GeoGebra
New Resources
多邊形的面積
球体的体积推导（优化版）
空间中两直线的位置关系
垂直線的斜率
盈利與虧蝕
Discover Resources
Fill the circle
找中點的坐標
空間中正立方體
S3 Law of Indices
八角柱(可側轉、上下轉)
Discover Topics
Rectangle
Equilateral Triangles
Similar Triangles
Unit Circle
Sine