Respuesta :

Stephen46

Answer:

Area of a semi circle is 1/2πr²

r = radius

Area = 1/2 × π × 18²

= 162π

= 508.94km²

Hope this helps.

ZJSG09112007

Answer:

508.68km^2

Step-by-step explanation:

[tex]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[/tex]

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