Question

The area of a semi circle is 27.72cm square. Find its perimeter

Answer 1

area of semicircle=27.72 cm sq

pi r sq=27.72

22/7* r sq=27.72

r sq=27.72*7/22

r sq=8.82

r=2.97 cm

its perimeter= 2 pi r

=2*22/7*2.97

=18.67 cm

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Answer 2

Answer:

13.2 cm

Step-by-step explanation:

Let r be radius of circle.

Area of Circle = πr²

Area of Semi Circle = 1/2 *  πr²

Given , Area of semi circle = 27.72 cm².

=> 1/2 * πr² = 27.72

=> πr² = 27.72 * 2 =  55.44

=> r² = 55.44 * 7/22 = 17.64

=> r = 4.2 cm.

Perimeter of Circle = 2πr

=> Perimeter of Semi Circle = πr = 22/7 * 4.2 = 13.2 cm.