如图,C为半圆内一点,O为圆心,直径AB长为2 cm,∠BOC=60°,∠BCO=90

如图,C为半圆内一点,O为圆心,直径AB长为2 cm∠BOC=60°∠BCO=90°,将BOC绕圆心O逆时针旋转至B′OC,点COA上,则边BC扫过区域(图中阴影部分)的面积为_________cm2

答案

【解析】

根据直角三角形的性质求出OCBC,根据扇形面积公式计算即可.

【详解】

解:∵∠BOC=60°∠BCO=90°

∴∠OBC=30°

∴OC=OB=1

则边BC扫过区域的面积为:

故答案为

【点睛】

考核知识点:扇形面积计算.熟记公式是关键.

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