问题
单项选择题
扇形半径为12，圆心角为60°，O为扇形的内切圆圆心，则图6-68中阴影部分的面积为（）。
A.8π
B.16π
C.20π
D.24π
E.以上结果均不正确
答案
参考答案：A
解析：
设扇形内切圆的半径为r，则
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扇形半径为12，圆心角为60°，O为扇形的内切圆圆心，则图6-68中阴影部分的面积为（）。
A.8π
B.16π
C.20π
D.24π
E.以上结果均不正确
参考答案：A
解析：
设扇形内切圆的半径为r，则
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