Multiple choice

The area of a circle is 616 cm$^2$. Find its circumference.

  1. $80 \ cm$
  2. $86 \ cm$
  3. $84 \ cm$
  4. $88 \ cm$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Area = pi * r^2 = 616. Using pi = 22/7, r^2 = 616 * 7 / 22 = 196. So r = 14. Circumference = 2 * pi * r = 2 * (22/7) * 14 = 88 cm.

AI explanation

Using the area formula Area = pi x radius^2 with pi as 22/7, we solve 616 = (22/7) x r^2 to find r^2 = 196, making the radius 14 cm. Applying the circumference formula C = 2 x pi x r gives 2 x (22/7) x 14 = 88 cm. The result is 88 cm.

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