角ABC=60
过 O作OD⊥AC于D
可得 ∠DOC=60
∠AOC=120
∠ABC=60 (同一弧长所对的圆周角等于圆心角的一半)
已知:如图,圆O是三角形ABC的外接圆,角ACO=30度.求角ABC的度数
已知:如图,圆O是三角形ABC的外接圆,角ACO=30度.求角ABC的度数
数学人气:184 ℃时间:2020-01-29 23:56:59
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