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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Dilate 習作
閱讀月曆
碎形六邊形的副本
鉛筆畫圓
拋物線2-焦點法

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定積分
整數
柱體
矩形
長方體

Why same areas?

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