Question

If the perimeter of a semi-circular park is 72 m, find its area and radius. ​

Answer 1

Answer:

Perimeter

$= \pi r + 2r = 72cm \\ \\ = r( \frac{22}{7} + 2) = 72 \\ \\ = r( \frac{22 + 14}{7} ) = 72 \\ \\ = r \times \frac{36}{7} = 72 \\ \\ = r = 14cm$

Area

$= \frac{ { \pi r}^{2} }{2} = \frac{22}{7} \times \frac{14 \times 14}{2} \\ \\ = 22 \times 14 \\ \\ = {308m}^{2}$

Hope it helps you from my side

Answer 2

Answer:

C = 2πR

72 = 2*22*R/7

36*7/22=R

R = 11.5 (APPROX)

AREA = πR²

AREA = 22*11.5*11.5/7

AREA = 415.7 (APPROX)

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