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ctr to mid perd
Author:
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GeoGebra
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兩組對邊相等和有直角的四邊形
近似值：有效數字
sanjiaohanshu
直角坐標平面上的旋轉變換
美國國旗 (Codex 版)
Discover Resources
八芒星
Introduce tangent ratio
曲线
project euler202（反射光线路线数）
HKCEE 2009 Q17
Discover Topics
Pythagoras or Pythagorean Theorem
Conditional Probability
Statistics
Cube
Parallelogram