If the area of a circle is 16π cm^2, find its radius.
Correct: B
The area of a circle is given by the formula A = πr^2, where A is the area and r is the radius. We are given that the area is 16π cm^2. Substituting this value in the formula, we get 16π = πr^2, which implies r^2 = 16. Taking the square root of both sides, we get r = 4 cm.