Question

the perimeter of a semicircular Park is
72 metre find its area and radius

Answer 1

perimeter of semicircular park= pi x r = 72
                                                         r=72X7/22
                                                         r=22.9 cm
are of semicircular park  pi x r2/2
                                    =882.3 cm2
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Answer 2

let the radius be r

the perimeter of the park = 72
(22/7 x r) +2r = 72
22r/7 + 2r =72
(22r +14r )/7 = 72
36r/7 = 72
36r =504
r=14

radius =14 m

area = 22/7 x 14 x 14 =616m^2