there is a square with sides of 13 . what is the area of the biggest circle that can be cut out of this square ?
"area of a circle = a = ï € r ^ 2 square is 13 wide , so circle ' s diameter would be 13 , and radius would be 6.5 a = ï € 6.5 ^ 2 which is approximately 132.73 answer is a"
circumface(divide(13, const_2))