Question

if the perimeter of a semi circular park is 72 m.find it's radius and area ​

Answer 1

Answer:

Given:-

Perimeter of circle = 72m

Let r be the radius of circle.

2πr/2 + 2r = 72

πr + 2r = 72

r = 72/π + 2

r = 72/(22/7 + 2)

r = 14m Ans.

Area of circle = πr²/2

                       = 22/7*14*14/2

                       = 308m²

The area and radius of circular park is 308m² and 14m.

Hope this helps.....

Answer 2

$perimeter \: of \: semicircular = \\ \\\pi \: r {}^{2} + 2r$

$r(\pi \: r \: + 2) = 72$