推荐回答（2个）
令角abc=x，角dac=y
则 有 abc=bac=acd
adc=dac=abc+bad
因为 dac+adc+acd=180
即 2x+2x+x=180
则 5x=180
所以 x=36
即 角abc=36度
设角ABC=x度
因为AB=AC
所以角B=角C=X
因为BD=DA
所以角BAD=角ABD=X
因为AC=CD
所以角ADC=角DAC=1/2（180-角C）=1/2(180-X)
因为角A=角BAD+角DAC=X+1/2(180-X)
又因为角B+角C+角BAC=180
=2X+x+1/2（180-x）
所以x=36度
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