on an aerial photograph ,the surface of a pond appears as circular region of ardius 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 closet estimate of the actual surface area of the pond,in square miles?
A1.3 B2.4 C3.0 D3.8 E5.0
答案是B，感谢。作者: flyever98 时间: 2013-1-3 21:35
半径是7/16 Inch
地图上1inch对应2mile
所以7/16inch 对应 7/8mile
r=7/8mile
求面积 s=3.14*r^2=2.404
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