Question

7.Findtheareaofsemicircleasdiameteris14cm.

(a)770cm². (b)77cm². (c)120cm². (d)noneofthese​

Answer 1

Diameter = 14 cm

Area of a semi-circle = 1/2 × πr²

where, π is 22/7 and r^2 is square of the radius.

Radius, r = Diameter/2 = 14/2 cm = 7 cm

Area of the semi-circle = 1/2 × 22/7 × 7 × 7

Area of the semi-circle = 11 × 7

Area of the semi-circle = 77cm²

Answer:

Area of the semi-circle is 77cm². Hence (b) 77cm² is the correct option.