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If the area of a semi-circle be 77 sq m, find its perimeter.

1. 36 m
2. 42 m
3. 48 m
4. 54 m
5. None of the above

Correct Option: A

According to the question,
Area of semi- circle = 77 m
(1/2) x π x r² = 77
⇒ r² = (77 x 2 x 7)/22
∴ r = 7m

∴Circumference of semi- circle =πr + 2r
= ( π + 2)r
= [(22/7) + 2] x 7
= 36 m