Question

The radius of a semicircle is 18 kilometers. What is the semicircle's area?

Answer 1

508.68km^2

Explanation:

`r= 18\\A of semicircle = (\pi*r^(2) )/(2) \\A = (3.14 *18^2)/(2) \\\\A = (3.14*324)/(2) \\\\A = (1,017.36‬)/(2) \\A = 508.68`

Answer 2

Area of a semi circle is 1/2πr²

r = radius

Area = 1/2 × π × 18²

= 162π

= 508.94km²

Hope this helps.