Given,
Length of the rectangle = AB = 20 cm
Breadth of the rectangle = BC = 14 cm
(i) Area of the shaded region = Area of rectangle – 2 x Area of the semi-circle
= l x b – 2 x 1/2 πr2
= 20 x 14 – (22/7) x 72
= 280 – 154
= 126 cm2
(ii) Length of the boundary of the shaded region = 2 x AB + 2 x circumference of a semi-circle
= 2 x 20 + 2 x πr
= 40 + 2 x (22/7) x 7
= 40 + 44
= 84 cm