Let's 'd' is
dia of circle=side of the square.
Area of blue=area of square - area of circle
=d^2-pi/4d^2..... (i)
Area of red =pi/4 d^2.... (ii)
Ratio of area of red/area of blue is
=(ii) /(i)
Pi/4 d ^2
=----------------
d^2-pi/4 d^2
Pi/4
=-------- (by removing d^2)
1-pi/4
=22/6 (by putting the value of pi =22/7)
So ratio is 22 to 6
ie 22:6 or 3.**********.... :1