Why same areas?

主題：面積

Given a parallelogram ABDC, E is a point on the line BD, and both lines AB and CE extend to meet at F. Prove that area of triangle ABE = area of triangle EDF. (Hint: Try to drag point E to point B as a diagonal BC)

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商高定理\水2
T7 geobra
abc731797
snooker
perimeter

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定積分
餘弦
黎曼和（Riemann Sum）
圖
柱體

Why same areas?

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