题目内容

已知:如图∠1=∠2,∠C=∠D,

∠A=∠F相等吗?试说明理由(14分)

 

答:相等

                                                    理由:∵∠1=∠2,∠AHC=∠2

                                                                          ∴∠AHC=∠1

                                                                            ∴BD∥CE

                                                                          ∴∠C=∠DBA

                                                                           ∵∠C=∠D

         ∴∠DBA=∠D∴DF∥AC∴∠A=∠F

解析:略

 

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