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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
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
兩組對邊相等的四邊形
Nested spiral octagon
拼砌四邊形
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習作A三ch1_11
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动点
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