Question

When the area of a certain circle is divided by pi, the result is the square of an integer. Which of the following could be the diameter of the circle.
A) 12
B)11
C)9
D)7
E)5

Answer 1

figured it out its 12 since it ask for the "square of an INTEGER" and the only number that spits out an integer would be 12

Answer 2

Yes, you are right. \[A=\pi*r ^{2}\] \[(\pi*r ^{2})/\pi=r ^{2}\] d=2r