Question 287594
The area of the smallest square that will contain a circle of radius 4 is

A) 8 B) 16 C) 32 D) 64 E) 128

The square has to contain the whole circle.
The circle has radius 4, so its diameter needs to be 8.
So each side of the square needs to be 8.
Area of a square is side^2.
8^2 = 64

D. 64