2. 外语
  3. The circle with center O below has radius 4. Find the following. (a)Circumference of the circle (b)Length of arc ABC (c)Area of

The circle with center O below has radius 4. Find the following. (a)Circumference of the circle (b)Length of arc ABC (c)Area of

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问题 The circle with center O below has radius 4. Find the following.
(a)Circumference of the circle
(b)Length of arc ABC
(c)Area of the shaded region
选项
答案(a)8π [*]
解析
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