GWD-20-7 (修改标题by Zeros)

saiever

 

GWD-20

Q7:
     

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?
     

     

A.      1.3
     

B.      2.4
     

C.      3.0
     

D.     3.8
     

E.      5.0
     

Answer: B
     

这题我算不出来B，我的答案为A，S=3.14*2*7/16*7/16

请问那里错了〉

这题我算不出来B，我的答案为A，S=3.14*2*7/16*7/16

请问那里错了〉

这题我算不出来B，我的答案为A，S=3.14*2*7/16*7/16

请问那里错了〉

chianalin

應該先將 inch換成miles 再算面積

Ans: {(7/16*2)^2}  *3.14

saiever

thanks,醒悟！