Why same areas?

Topic:Area

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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長方體平面投影 (Codex版)
畫出對稱圖形
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
美國國旗 (Codex 版)

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高中數學_高二上
Properties of Inequalities 不等式的加法與乘法性質
三平行線上作正三角形
Copy of 軸對稱
球体的体积推导

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