【单选题】
网考网参考答案:C
网考网解析:
If r is the radius of the white circle, 2r is the radius of the shaded semicircle. The area of the white circle is πr 2 . The area of the semi-circle is [*], so the area of the shaded region is [*] The columns are equal (C). [*] **The solution is even easier if you use TACTIC 1, Chapter 12. Let the radius of the circle be I instead of r, and proceed as above. The area of each region is π.
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