2第7题△ABC中,AB=AC,AD是高。求证(1)BD=CD(2)∠BAD=∠CAD
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2第7题△ABC中,AB=AC,AD是高。求证(1)BD=CD(2)∠BAD=∠CAD
2第7题
△ABC中,AB=AC,AD是高。求证(1)BD=CD(2)∠BAD=∠CAD
2第7题△ABC中,AB=AC,AD是高。求证(1)BD=CD(2)∠BAD=∠CAD
易证△ABD与△ACD全等
(AD=AD,AB=AC,∠ADB=∠ADC=90°)(HL定理)
所以BD=CD
∠BAD=∠CAD得证
这种题都是证明三角形全等的!