Question 1028258
Call the radius of the circle, r.
Its diameter is 2r.
The side of the square is then also 2r.
The area of the circle is {{{A = (pi)r^2}}}.
The area of the square is {{{A = (2r)^2 = 4r^2}}}.
The ratio is {{{4r^2 / ((pi)*r^2) = 4/(pi)}}}.