Question

The area of circle A is 9 times greater than the area of circle B. If the radius of circle B is 4 meters, what is the radius of circle A? (Multiple Choice)

Answer 1

A. 9 meters

B. 12 meters

C. 24 meters

D. 36 meters

Answer 2

The area of a circle is expressed by a=(pi)(r^2).
Solving for the area of circle b using the formula above it is 59.26.
We know that the area of circle a is 9 times greater than circle b.
We must now solve for the area of circle a and find the radius.
The area of circle a is 533.34.
R= sq. root of a/pi.. Solving for the radius it is approximately 13. This is not the exact answer. The closest answer is 12.

The answer is B.