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Ce df - PowerPoint PPT Presentation

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343 views • 21 slides

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平行四边形的判别 (2)

平行四边形的判别 (2). 40. A. B. 探索 : （课本 P91. ）. 30. 30. 40. D. C. 如图，将两根长 40cm 的木条和两根长 30cm 的木条作为四边形的四条边，能否拼成一个平行四边形？与同伴进行交流。. 判别方法四 :. 两组对边分别相等的四边形是平行四边形. A. D. B. C. 符号语言：. ∵ AB=DC AD=BC ∴ 四边形 ABCD 是平行四边形. 平行四边形的判别方法：. 两组对边分别相等的四边形是平行四边形.

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340 views • 13 slides

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Ce df - PowerPoint PPT Presentation

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平行四边形的判别 (2)