Question

the area of a semicircle is 157 cm² . Its diameter
(a) 10cm
(b) 12cm
(C) 20cm
(d) 40cm​

Answer 1

Given:   radius of a semicircle is 10cm

To find :  area and circumference.

Solution:

Radius of Semi circle  = 10 cm

Area of Semi  circle = (1/2) π r²

using π = 3.14

r = radius = 10 cm

Area of Semi  circle = (1/2) (3.14) (10)²

= 157 cm²

Circumference of Semicircle  = Diameter  + arc Length

= 2(radius)  + (1/2) 2 π r

= 2 * 10  + 3.14 * 10

= 20 + 31.4

= 51.4  cm

Area of Semi  circle =  157 cm²

Circumference of Semicircle  =   51.4  cm

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