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同心圓
Author:
許清惟
GeoGebra
New Resources
四邉形 (四年級) 教師版
長方體平面投影 (Codex版)
近似值：有效數字
美國國旗 (Codex 版)
Fibonacci Clock
Discover Resources
正方變十字
餘弦定理
內切圓
Bar Chart and Pie Chart(棒形圖及圓形圖)
Copy of 分數認識
Discover Topics
Geometric Transformations
Isosceles Triangles
Planes
Trigonometric Functions
Arithmetic