Multiple choice

The area of a circle is $394.24$ $cm^2$. What is t he radius of the circle ?

  1. $11.2 cm$
  2. $12.1 m$
  3. $13.5 m$
  4. $15.0 m$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Area = pi * r^2 = 394.24. r^2 = 394.24 / 3.14 = 125.55. r = sqrt(125.55) = 11.2. The units in the options are inconsistent (cm vs m), but the value 11.2 is correct.

AI explanation

The area of a circle is given by the formula pi * r^2. Setting this equal to the given area results in (22/7) * r^2 = 394.24. Solving for r^2 gives 125.44, so the radius is the square root of 125.44. This results in a radius of 11.2 cm.

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