Question

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

Answer 1

Answer:

Area of a semi circle is 1/2πr²

r = radius

Area = 1/2 × π × 18²

= 162π

= 508.94km²

Hope this helps.

Answer 2

Answer:

508.68km^2

Step-by-step explanation:

$r= 18\\A of semicircle = \frac{\pi*r^{2} }{2} \\A = \frac{3.14 *18^2}{2} \\\\A = \frac{3.14*324}{2} \\\\A = \frac{1,017.36‬}{2} \\A = 508.68$