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nadya68 [22]
3 years ago
9

Find the area of a circle with the circumference 18(pi)

Mathematics
2 answers:
jek_recluse [69]3 years ago
8 0

Circumference = 2\pi r

\frac{18\pi}{2\pi} = \frac{2\pi r }{2\pi }

18 ÷ 2 = 9

r = 9

-----------------------------------------------------------------------------------------------------------------

Area = \pi r^{2}

= \pi (9)^{2}

= 81\pi units².

JulsSmile [24]3 years ago
5 0

Answer:

D 81 pi units^2

Step-by-step explanation:

The circumference of a circle  is given by

C = 2 * pi *r

18 pi = 2 * pi *r

Divide each side by 2 * pi

18 pi / (2 pi) = 2 pi * r/ (2 pi)

9 = r

Now we can find the area.  Area is given by

A = pi r^2

A = pi * 9^2

A = 81 pi units^2

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