如图△ABC中,AB=AC,AD是高.求证:(1)BD=CD;(2))∠BAD=∠CAD 最好用HL证明的
4个回答
∵AD是高
∴∠ACD+∠AED=90°
在RT△ABD 和RT△ACCD中
AD=AD
AB=AC
∴RT△ABD ≌RT△ACD
∴BD=CD ∠BAD=∠CAD
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