A circle is inscribed in a square. If the area of the square is 16, what is the area of the circle?
Correct: C
The area of the square is 16, so the side length of the square is sqrt(16) = 4. The diameter of the inscribed circle is equal to the side length of the square, so the diameter is 4, and the radius is 2. The area of the circle is πr^2 = π(2^2) = 4π.