Multiple choice

The area of a circle is $154$ sq. cm. Its circumference is

  1. $22cm$
  2. $35cm$
  3. $44cm$
  4. $28cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The area of a circle is pi * r^2 = 154. Using pi = 22/7, r^2 = 154 * 7 / 22 = 49, so r = 7. The circumference is 2 * pi * r = 2 * (22/7) * 7 = 44 cm.

AI explanation

Using the area formula Area = pi x radius^2 and approximating pi as 22/7, we have 154 = (22/7) x r^2, giving r^2 = 49 and a radius of 7 cm. Applying the circumference formula C = 2 x pi x r gives 2 x (22/7) x 7 = 44 cm. The result is 44 cm.

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