设角B=角CAB=x 则角BAD=90-x 角BAD+角EAD=1/2角BAC 即90-x+18=0.5x
解得x=72° 所以∠ACD=180-2x=36°
还有一种是设∠ACD=x 则∠CAB=∠ABC=0.5(180-x)∠CAD+∠DAE=0.5∠CAB
即90-x+18=0.5*0.5(180-x) 解得x=84°
设角B=角CAB=x 则角BAD=90-x 角BAD+角EAD=1/2角BAC 即90-x+18=0.5x
解得x=72° 所以∠ACD=180-2x=36°
还有一种是设∠ACD=x 则∠CAB=∠ABC=0.5(180-x)∠CAD+∠DAE=0.5∠CAB
即90-x+18=0.5*0.5(180-x) 解得x=84°