Question 849406
The diameter of the lake of 1 mile is 1720 yards.
The radius is 1720/2 = 860 yards.
Area = {{{(pi)*(860)^2}}}yd^2
Area = {{{(pi)*739600}}}yd^2
There are 4840 square yards to the acre
So area in acres is
{{{(pi)*739600/4840}}}
approximately
{{{(pi)*152.81}}} = 480 acres