Question

Q1. The circular portions of the following figures are semicircles. For
each of the following figures, find perimeter and area.
(a)
(b)
​

Answer 1

Answer: a)i Area=544.25 cm² ii) Perimeter= 125cm

b)i Area=943.25 cm² ii) Perimeter= 77cm

Step-by-step explanation:

a)i Area of the figure= (Length*Breadth)+(½*22/7*r1²)+ (½*22/7*r2²) = (21*14)+(½*22/7*7²)+(½*22/7*10.5²)= 544.25cm²

ii) Perimeter of the figure= 2(l+b) + (22/7 *r1)+ (22/7*r2) =2(14+21) + (22/7*10.5)+(22/7*7) = 125cm

b)i Area of the semicircle= (½*22/7*24.5²)=943.25cm²

ii Perimeter of the semicircle= (22/7*24.5)= 77cm