Multiple choice

What is the radius of a circle of area $616\ { cm }^{ 2 }$?

  1. $16 cm$
  2. $12 cm$
  3. $14 cm$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Area = pi * r^2 = 616. (22/7) * r^2 = 616. r^2 = 616 * 7 / 22 = 28 * 7 = 196. r = sqrt(196) = 14 cm.

AI explanation

Use the area of a circle formula, pi times radius squared equals 616. Substituting pi as 22 divided by 7 gives radius squared equals 616 times 7 divided by 22, which simplifies to 196. Taking the square root of 196 gives the radius of 14 cm.

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