Question

The area of a circle is 346.5 cm2. find its circumference (in cm).

Answer 1

HEY HERE IS YOUR ANSWER☺☺

Area of circle = 346.5 square cm.

$346.5 = \pi {r}^{2} \\ \\ \frac{346.5}{\pi} = {r}^{2} \\ \\ \frac{3465}{10} \div \frac{22}{7} = {r}^{2} \\ \\ \frac{3465 \times 7}{10 \times 22} = {r}^{2} \\ \\ \frac{315 \times 7}{10 \times 2} = {r}^{2} \\ \\ \frac{63 \times 7}{2 \times 2} = {r}^{2} \\ \\ \frac{441}{4} = {r}^{2} \\ \\ \sqrt{ \frac{441}{4} } = r \\ \\ \frac{ \sqrt{441} }{ \sqrt{4} } = r \\ \\ \frac{21}{2} = r \\ \\ 10.5 = r$

If its radius is 10.5 cm or 21/2 cm , we can easily find the circumference . While taking out the circumference i am taking radius as 21/2.
You can take either 10.5 or 21/2 .

$circumference \: of \: \: circle \: \\ = 2\pi r \\ \\ = 2 \times \frac{22}{7} \times \frac{21}{2} \\ \\ = 2 \times 11 \times 3 \\ \\ = 66 \: \: cm$

Circumference of circle = 66 cm.

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Answer 2

Answer:

10.5

Step-by-step explanation:

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