Question

The area of a circle is 616cm2 .Find ita circumference​

Answer 1

Answer:

$area \: of \: circle \: = \pi {r}^{2} \\ = > 616 = \frac{22}{7} {r}^{2} \\ = > 22 {r}^{2} = 616 \times 7 \\ = > {r}^{2} = \frac{616 \times 7}{22} \\ = > {r}^{2} = 2 8 \times 7 \\ = > {r}^{2} = 196 \\ = > r = \sqrt{196} \\ = > r = 14 \: cm$

So,

$circumference \: of \: circle = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 14 \\ = 2 \times 22 \times 2 \\ = 88 \: cm$

Answer 2

Area of circle=πr²

616=r²22/7

616*7/22=r²

196=r²

r=√196=14

Circumference=2πr

=2*22/7*14

=88cm