求教一道GWD数学，没有看懂题....

camelo777

On an aerial photograph, the surface of a pond appears as circular region of radius 7/16 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?

A. 1.3
B. 2.4
C. 3.0
D. 3.8
E. 5.0

答案是B，有没有NN给我解释下题目的意思..

huanxiang

一个比例问题，图和实际的比例是1：200，相应的面积比例为1:40000 算出图的圆的面积 乘上就是了

camelo777

明白了，谢谢LS

alexlixin

考估算约数和比例，S=3.14*(7/16*2)^2=3.14*49/64,近似=3*48/60=2.4,选B