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Area of semi circle = π r² /2
⇒π r² /2 = 308
⇒ r² =616/π
so, radius, r = 14 cm
now perimeter = 2π r/2 = π r
                        =π ×14
                        = 44 cm
∴perimeter = 44 cm
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not getting the edit icon..its bcz u have reported this
area of semi circle=π r²/2
=>308=π r²/2
we know that,
perimeter of semicircle=π r+2r
                                     = 72m.

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