过点C作CF⊥y轴于点F,∴∠AFC=90°,∴∠CAF+∠ACF=90°．∵△ABC中是等腰直角三角形,∠BAC=90°,∴AC=AB,∠CAF+∠BAO=90°,∠AFC=∠BAC,∴∠ACF=∠BAO．在△ACF和△ABO中,∠AFC＝∠BAC    ∠ACF＝∠BAO &n...