已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD

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已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD已知角A

已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD
已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD

已知角AOB:角BOC:角COD=3:2:4,角AOD=180度,求角AOB,角BOC,角COD
设x
3x+2x+4x=180°
x=20°
∴∠AOB=60°
∠BOC=40°
∠COD=80°