Multiple choice

What is the area (in sq cm) of a circle whose circumference is 22 cm?

  1. 77

  2. 38.5

  3. 44

  4. 88

  5. 96
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Circumference = 2*pi*r = 22. r = 22 / (2 * 22/7) = 3.5. Area = pi*r^2 = (22/7) * 3.5 * 3.5 = 22 * 0.5 * 3.5 = 38.5.

AI explanation

Using the circumference formula, C equals 2 times pi times r, we have 22 equals 2 times 22 over 7 times r, which gives a radius of 3.5 centimeters. The area of the circle is pi times r squared, so we calculate 22 over 7 times 3.5 squared, resulting in 38.5 square centimeters.

Keep practicing — related questions