Question 872153
100=10^2, so side length of the square is 10 feet.  Perimeter is 4*10=40 feet.


Circumference of this perimeter turned into a circle is {{{2*pi*r=40}}};
{{{r=20/pi}}}.


This circle's area is {{{pi*r^2=pi*(20/pi)^2=highlight(400/pi=127.3)}}}.