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The two circles in the figure shown have a common center at O, the area of the shaded region is 40π, and the measure of angle AOC is $$90°$$.
Quantity A
The circumference of the smaller circle
Quantity B
The length of arc ABC
D显示答案
· 相关考点
4.5.3 弧长与扇形面积
4.5.3 弧长与扇形面积
以上解析由 考满分老师提供。