Mensuration Practice Test 3

Question : 13 of 40

Marks: +1, -0

If the area of a semicircle is 77 sq. m, find its perimeter.

Solution:

Area of the semicircle =

{πr^2}/2

77 m^2

{22×r^2}/{7×2}

= 77

r^2

{77×14}/{22}

r^2

= 49 m
r = 7 m
Perimeter of the semicircle =

{2πr}/2

2/2 × {22}/7 × 7

= 22 m.

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