Area of shaded region A = Area of shaded region C = Area of semicircle with radius 3m – Area of semi-circle with radius 2 m + Area of semi-circle with radius 1 m
=
1
2
π×32−
1
2
π×22+
1
2
π×12
=3πm2 Area of the region B = Area of the circle – Area of shaded region A –Area of shaded region C =π×32−3π−3π =9π−6π =3πm2 Therefore, ratio of the three areasA, B and C =3π:3π:3π=1:1:1