meili 发表于 2022-10-27 15:40:36

【如图,在∠EAF的平分线上取点B作BC⊥AF于点C,在直线AC上取一动点P,顺时针作∠PBQ=2∠ABC,另一边交AE于点Q.(1)当点P在点A右侧时,求证:AQ+AP=2AC;(2)当点P在点A左侧时,AQ、AP、AC三条】

<p>问题:【如图,在∠EAF的平分线上取点B作BC⊥AF于点C,在直线AC上取一动点P,顺时针作∠PBQ=2∠ABC,另一边交AE于点Q.(1)当点P在点A右侧时,求证:AQ+AP=2AC;(2)当点P在点A左侧时,AQ、AP、AC三条】
<p>答案:↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">蒋良孝的回答:<div class="content-b">网友采纳  证明:(1)如图1,作BM⊥AE垂足为M,∵BC⊥AF,∴∠BMA=∠BCA=90°,在△ABM和△ABC中,∠BMA=∠BCA∠BAM=∠BACBA=BA,∴△ABM≌△ABC,∴∠ABM=∠ABC,AM=AC,BM=BC,∵∠PBQ=2∠ABC,∴∠PBQ=∠CBM,∴∠CBP=∠MB...
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查看完整版本: 【如图,在∠EAF的平分线上取点B作BC⊥AF于点C,在直线AC上取一动点P,顺时针作∠PBQ=2∠ABC,另一边交AE于点Q.(1)当点P在点A右侧时,求证:AQ+AP=2AC;(2)当点P在点A左侧时,AQ、AP、AC三条】