【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. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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