Multiple choice

The perimeter of a circle having area 154 sq. cm is

  1. 22 cm

  2. 44 cm

  3. 88 cm

  4. 66 cm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Area = pi*r^2 = 154. Using pi = 22/7, r^2 = 154 * 7 / 22 = 49, so r = 7 cm. Perimeter (circumference) = 2*pi*r = 2 * (22/7) * 7 = 44 cm.

AI explanation

Using the area of a circle formula, 154 = pi*r^2, and substituting pi as 22/7 gives r^2 = 49, meaning the radius r is 7 cm. The perimeter of a circle is its circumference, calculated using the formula 2*pi*r. Substituting the known values gives 2*(22/7)*7, which equals 44 cm.

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