问题补充:
已知,如图,AB=AD,AC=AE,∠BAD=∠CAE若BC与DE相交于O,与AD相交于F,求证∠BOD=∠BAD
答案:
因为,在△ABC和△ADE中,AB=AD,∠BAC=∠BAD+∠CAD=∠CAE+∠CAD=∠DAE,AC=AE,
所以,△ABC ≌ △ADE ,
可得:∠ABC = ∠ADE ,
所以,∠BOD = 180°-∠ADE-∠OFD = 180°-∠ABC-∠AFB = ∠BAD .
时间:2020-06-12 09:29:04
已知,如图,AB=AD,AC=AE,∠BAD=∠CAE若BC与DE相交于O,与AD相交于F,求证∠BOD=∠BAD
因为,在△ABC和△ADE中,AB=AD,∠BAC=∠BAD+∠CAD=∠CAE+∠CAD=∠DAE,AC=AE,
所以,△ABC ≌ △ADE ,
可得:∠ABC = ∠ADE ,
所以,∠BOD = 180°-∠ADE-∠OFD = 180°-∠ABC-∠AFB = ∠BAD .