SOLUTION: Which of the following most closely approximates the surface area (in acres) of a circular lake that measure 1 mile across?

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: Which of the following most closely approximates the surface area (in acres) of a circular lake that measure 1 mile across?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 849406: Which of the following most closely approximates the surface area (in acres) of a circular lake that measure 1 mile across?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
The diameter of the lake of 1 mile is 1720 yards.
The radius is 1720/2 = 860 yards.
Area = %28pi%29%2A%28860%29%5E2yd^2
Area = %28pi%29%2A739600yd^2
There are 4840 square yards to the acre
So area in acres is
%28pi%29%2A739600%2F4840
approximately
%28pi%29%2A152.81 = 480 acres