GMAT
题目
If the diameter of circle A is eight times that of circle B, what is the ratio of the area of circle A to the area of circle B ?
解析
已知
\frac{d_1}{d_2} = 8
面积比为：
\frac{A_1}{A_2} = \frac{\pi (d_1)^2}{\pi (d_2)^2} = \left(\frac{d_1}{d_2}\right)^2 = 8^2 = \frac{64}{1}
因此，选项 E 正确。
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