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兩組對邊相等的四邊形（三年級）
Author:
Anthony OR 柯志明
Topic:
Parallelogram
,
Quadrilaterals
https://www.geogebra.org/m/ztnfsrt5
New Resources
四邉形 (四年級) 教師版
sanjiaohanshu
四邊形的特性
算柱 (兩位數)
判斷球體
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B3C2-2例6-1
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