Question

the area of a circle is
$9\pi \: cm ^{2} \\ find \: it \: s \: circumference \\ \: options \: are \\ 1. \: 36\pi \: cm \\ 2. \: 6\pi \: cm \\ 3. \: 9\pi \: cm \\ 4. \: 36 \pi^{2} \: cm$
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Answer 1

Answer:

The answer is 6π cm

Step-by-step explanation:

Given

Area if circle = 9π cm^2

πr^2 = 9π

π will be cancelled

r^2 = 9

r=√9= 3cm

Now,

Circumference of circle= 2πr= 2π×3= 6π cm

Answer 2

Answer:

answer is 2) 6π

Step-by-step explanation:

$area \: of \: circle \: = \pi {r}^{2} \\ 9\pi = \pi {r}^{2} \\ \frac{9\pi}{\pi} = {r}^{2} \\ {r}^{2} = 9 \\ r = 3 \\ \\ cicumfence \: of \: circle = 2\pi \: r \\ = 2 \times \pi \times 3 \\ = 6\pi$

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