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congruent triangles_provided by Mr Yeung Kar Chun
Author:
kidmancmw
GeoGebra
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四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
畫出對稱圖形
兩組對邊相等和有直角的四邊形
球體建築師
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Trapezoid1
多項式函數及其圖形
四邊形外接正方形
二次方程动态函数曲线
剪切成正三棱柱（制作：李三军，修订：孟宝兴）
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Equilateral Triangles
Pyramid
Parallelogram
Binomial Distribution
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