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平行四邊形的面積
Author:
Anthony OR 柯志明
拖拉紅點，改變平行四邊形的形狀。
平行四邊形和長方形的面積是否一定相等？
點選「分割平行四邊形」進行探究。
柯志明 香港 GeoGebra 學院
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