1 Answer

G Davison · Answer 1 · 2020-11-12T05:46:40+0000

Answer:

20.25π

Explanation:

The circumference (C) of a circle is calculated using the formula

C = 2πr ← r is the radius

given C = 9π, then

2πr = 9π ( divide both sides by 2π )

r =
$(9\pi )/(2\pi )$ ( cancel the π on numerator/denominator )

= 4.5

The area (A) of a circle is calculated using the formula

A = πr² = π × 4.5² = 20.25π

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