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Drag the red dots, see the area ratio of EHFG to ABCD
Author:
johnmayhk
GeoGebra
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兩位數加法
拼砌四邊形
兩組對邊相等和有直角的四邊形
第八周作业
四邉形 (四年級) 教師版
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test
Quiz on Projection of a Line Segment on a Plane 投影：測驗
角定義
勝者即正義
同心六邊形
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Exponent
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