oc平分角aob,角bod比角aod小30度,求角cod的度数

∵OC平分∠AOB,
∴∠AOC=∠BOC,
∵∠AOD=∠BOD+30°
∴∠AOC+∠COD=∠BOD+30°
=∠BOC-∠COD+30°
∴∠COD=15°