If area of a semicircular field is 30800 sq m then find its perimeter.

1.	If area of a semicircular field is 30800 sq m then find its perimeter.
Answer» Which answer is right for above question 440m or 720m Area of semi circle = π r² /2⇒π r² /2 = 30800⇒ r² =61600/π =19600so, radius, r = 140 cmnow perimeter = 2π r/2 = π r =π ×140 = 440 m∴perimeter = 440 m\xa0 720cm

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