如图所示,已知∠AOC=∠BOD=100°,且∠AOB:∠AOD=2:7,求...？
YYS有始无终
2022-05-14 12:11
AOC是90度吗
u_114059636 2022-05-14 12:20 ∵∠AOC=∠BOD=100°∴∠AOB+∠BOC=∠BOC+∠COD∴∠AOB=∠COD设∠AOB=∠COD=2X∵∠AOB：∠AOD=2:7∴∠AOD=7X∵∠AOD=∠AOB+∠BOC+∠COD∴∠BOC=3X∵∠AOC=∠AOB+∠BOC=100°=5X∴X=20°∴∠BOC=60°，∠COD=40°
u_114059636 2022-05-14 12:20 ∵∠AOC=∠BOD=100°∴∠AOB+∠BOC=∠BOC+∠COD∴∠AOB=∠COD设∠AOB=∠COD=2X∵∠AOB：∠AOD=2:7∴∠AOD=7X∵∠AOD=∠AOB+∠BOC+∠COD∴∠BOC=3X∵∠AOC=∠AOB+∠BOC=100°=5X∴X=20°∴∠BOC=60°，∠COD=40°
