BO垂照垂直AO,OD平分角BOC,角AOC等于5/2角BOD,求角COD

问题描述:

BO垂照垂直AO,OD平分角BOC,角AOC等于5/2角BOD,求角COD

∵BO⊥AO ∴∠AOB=90° ∴∠BOA(大角)=360°-90°=270° ∵OD平分∠BOC ∴∠BOC=2∠BOD ∵∠AOC=5/2∠BOD ∴∠AOC=5/4∠BOC ∵∠BOA(大角)=360°-90°=270° ∵∠BOA=∠AOC+∠BOC 即27...