qing.da.jia bang wo ba Guo Cheng.

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qing.da.jia bang wo ba Guo Cheng.

qing.da.jia bang wo ba Guo Cheng.
qing.da.jia bang wo ba Guo Cheng.
 

qing.da.jia bang wo ba Guo Cheng.
连接BC,∵∠DFE=∠BFC﹙对顶角相等﹚,
∴由内角和定理得:∠D+∠E=∠FBC+∠FCB,
而由△ABC内角和=180°得:
∠A+∠ABC+∠ACB=﹙原来的图形的﹚∠A+∠B+∠C+∠D+∠E=180°.

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