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Tusi Couple
Author:
Chenwei Chen
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
直角坐標平面上的旋轉變換
判斷球體
四邉形 (四年級) 教師版
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正二十面體
parabola
Verification of Pythagoras Theorem 驗証畢氏定理
工具：PlaneText, PlaneArrow
轴对称的两点的动画演示.许兴华数学
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Angles
Rhombus
Parallelogram
Fractal Geometry
Trigonometry