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平行四边形的认识与证明 PowerPoint PPT Presentation


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平行四边形的认识与证明. D. A. E. B. C. 关于平行四边形的角. 如图,在平行四边形 ABCD 中, DB=DC ,∠ A=65 ○ , CE⊥BD 于 E ,则∠ BCE=______. 关于平行四边形的角. 平行四边形的一个外角为 60 度,则平行四边形的四个内角分别为 ____________. 120 ○ , 60 ○ , 120 ○ , 60 ○. 分析 :. 外角与相邻的内角互补,所以 60 度的外角相邻的内角为 120 度,而平行四边形的对角相等,所以,有一对内角为 120 度,另一对内角为 60 度。. 关于平行四边形的角.

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平行四边形的认识与证明

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3710147


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D

A

E

B

C

ABCDDB=DCA=65CEBDEBCE=______


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  • 60____________

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35

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D

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