Summer hoilday HW Math

ares of the square = 10cm x 10cm = 100cm^2
ares of the circle = 3.14 x (10cm/2)^2 = 78.5cm^2
ares of the shaded region = ares of the square- ares of the circle
= 21.5cm^2
ratio of the shaded region to the ares of the square = 21.5 : 100
= 1 : 4.65