Question

The area of a circle is 616 cm. Find its circumference.​

Answer 1

Answer:

Step-by-step explanation:

616 cm^2 = 22/7 × r^2

616 cm^2 × 7/22 = r^2

56 cm^2 × 7/2 = r^2

28 cm^2 × 7 = r^2

196 cm^2 = r^2

14 cm = radius.

C = 2 × 22/ 7 × 14 cm

= 2 × 22 × 2 cm

= 88 cm

Hope it helps

Answer 2

Answer:

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