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Why same areas?
Autor:
Terry Tam
Tema:
Área
GeoGebra
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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盈利與虧蝕
第八周作业2
垂直線的斜率
圓的切線方程
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