The length of a chain used as boundary of the semi circular park is 90cm .Find the area of the park

The length of a chain used as boundary of the semi circular park is 90

1.	The length of a chain used as boundary of the semi circular park is 90cm .Find the area of the park
Answer» Length of the boundary of the semicircular park = 90 m⇒\xa0πr + 2r = 90⇒ r(22/7 + 2) = 90⇒ r = (907)/36⇒ r = 17.5 mArea of the semicircular park = 1/2πr²= 1/222/717.517.5= 481.25 sq m