Question

If the radius of a circle is increased by a factor of 3, how will the area of the object be affected?

A. increase by a factor of 3
B. increase by a factor of 6
C. increase by a factor of 9
D. increase by a factor of 12

Answer 1

Area of a Circle is directly proportional to the square of it's radius. So, if radius is increased by 3, area will increase by 3^2 = 9

In short, Your Answer would be: Option C

Hope this helps!