(1)∠AOC=∠BOD
理由:∠COD=∠AOB=90°
∠COD+∠AOD=∠AOB+∠AOD
即:∠AOC=∠BOD
(2)∠BOC=360° -∠AOB-∠AOD-∠DOC
=360°-90°-52°-90°
=128°
(3)问题打对了没?
(1)∠AOC=∠BOD
理由:∠COD=∠AOB=90°
∠COD+∠AOD=∠AOB+∠AOD
即:∠AOC=∠BOD
(2)∠BOC=360° -∠AOB-∠AOD-∠DOC
=360°-90°-52°-90°
=128°
(3)问题打对了没?