if the perimeter of semi circular park is 72m find its radius and area

perimeter of a semi circle =half of its perimeter of whole circle +diameter

ie 1/2 x 2 x pie x r+ 2 x r Iperimeter=2 x pie x r and diameter =2 r

ie 22/7 x r+ 2r = 72

22 x 3r=72 x 7

3r=504/22

3r=22.9 (approx)

r=22.9/3

r=7.63

therefore radius =7.63 m (approx)

area=pie xr²

=22/7 x 7.63²

=182.96 m (approx)