A square is inscribed in a circle of radius 5. What is the area of the square?

✓ Correct Answer: Option B

The diagonal of the inscribed square is equal to the diameter of the circle. Diameter = 2 * radius = 2 * 5 = 10. If 's' is the side of the square, then s^2 + s^2 = 10^2, or 2s^2 = 100. Thus, s^2 = 50. The area of the square is s^2, which is 50.