Problem Solving

试题详情

题目:

On an aerial photograph, the surface of a pond appears as circular region of radius  inch.  If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles, which of the following is the closest estimate of the actual surface area of the pond, in square miles?

选项:

A、1.3
B、2.4
C、3.0
D、3.8
E、5.0

答案:

B

提问:

π(7/16)^2 *2 这样列为什么算不对呢?
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