角AOC=角BOD=90°,角AOD=130°,求角BOC的度数.
问题描述:
角AOC=角BOD=90°,角AOD=130°,求角BOC的度数.
答
因为 ∠COD = ∠AOD - ∠AOC
= 130° - 90 °
= 40°
所以 ∠BOC = ∠BOD + ∠COD
= 90°+ 40°
=130°