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2015-12-20T12:36:46+05:30

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Area of semi circle = π r² /2
⇒π r² /2 = 308
⇒ r² =616/π
        =196
so, radius, r = 14 cm
now perimeter = 2π r/2 = π r
                        =π ×14
                        = 44 cm
∴perimeter = 44 cm
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wrong... perimeter = 44 + diameter = 44 +28 = 72 cm
2015-12-20T12:45:39+05:30
given :
area of semicircular region = 308 square cm.
to find out the area of semi circular path =  \pi r² /2 = 308
r² = 616/  \pi
∴ r = 14 cm

perimeter = 2 \pi r/2 =  \pi
                =  \pi * 14
                = 44 cm
∴ perimeter - 44 cm
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