10.
如图,点A,O,C在同一直线上,
(1)若∠AOB=55°,则∠BOC=125°;
(2)若∠AOB=56°32′,则∠BOC=123°28′;
(3)若∠AOB:∠BOC=1:2,求∠BOC的度数.
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(1)若∠AOB=55°,则∠BOC=125°;
(2)若∠AOB=56°32′,则∠BOC=123°28′;
(3)若∠AOB:∠BOC=1:2,求∠BOC的度数.