上册么?
∵AB=AC
∴角ABC=角ACD
∵AD是高
∴角ADB=角ADC=90°
在△ABD和△ACD中
角ABD=角ACD,角ADB=角ADC,AD=AD
∴△ABD≌△ACD(AAS)
∴BD=CD
∴角BAD=角CAD
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