Question

the area of the area of a circle is 616 CM square find its circumference

Answer 1

Area of circle=πr²
616=r²22/7
616*7/22=r²
196=r²
r=√196=14
Circumference=2πr
=2*22/7*14
=88cm

Answer 2

Answer:

$\sf \: \pi {r}^{2} = 616 \\ \\ \sf \: {r}^{2} = \frac{616 \times 7}{22} \\ \ \\ \sf\: {r}^{2} = 28\times 7 \\ \\ \sf \: r = 14 \\ \\ \sf \: Circumference = 2\pi r = 2 \times \frac{22}{7} \times 14 = 88cm \\ \\ \sf \: Circumference_{(Circle)} \blue{=88cm}$