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旋轉正方形
Author:
33陳郁婷
GeoGebra
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兩位數除以一位數（二）
畫出對稱圖形
拼砌四邊形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
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圓周角與弦切角
圖E
齿轮咬合
example 3
invariance interval
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Right Triangles
Translation
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Subtraction
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