Question

．如圖，下列說(shuō)法錯(cuò)誤的是（　�。�                                                       

                                                                     

A．若a∥b，b∥c，則a∥c                             B．若∠1=∠2，則a∥c           

C．若∠3=∠2，則b∥c                                   D．若∠3+∠5=180°，則a∥c         

Answer 1

C【考點(diǎn)】平行線的判定．                                                                      

【分析】根據(jù)平行線的判定進(jìn)行判斷即可．                                             

【解答】解：A、若a∥b，b∥c，則a∥c，利用了平行公理，正確；             

B、若∠1=∠2，則a∥c，利用了內(nèi)錯(cuò)角相等，兩直線平行，正確；                

C、∠3=∠2，不能判斷b∥c，錯(cuò)誤；                                                      

D、若∠3+∠5=180°，則a∥c，利用同旁內(nèi)角互補(bǔ)，兩直線平行，正確；                    

故選C．                                                                                            

【點(diǎn)評(píng)】此題考查平行線的判定，關(guān)鍵是根據(jù)幾種平行線判定的方法進(jìn)行分析．