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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圓錐的展開圖
圓形墊圈 (Washer)
斯霍滕(Schooten)定理(與角平分線定理等價)
練習_對稱
公因數

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不等式
柱體
正弦
導數
反射

Why same areas?

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