已知在圆O中弦AB=12cmO到AB的距离等于AB的一半求角AOB的度数和
等于AB的一半求角AOB的度数和圆的半径
人气：247 ℃ 时间：2019-10-17 07:15:29
解答
设O到AB的距离为OC
那么OC⊥AB
AC=CB=1/2AB=6
因为OC=1/2AB=6
所以∠AOC=45°
∠AOB=90°
OA=6√2
答：角AOB的度数是90°
圆的半径是6√2 cm.
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