OpenSAT

The circumference of a circle is given by the formula C = 2\pi r, where r is the radius of the circle. We are given that the circumference is 10\pi, so 10\pi = 2\pi r. Dividing both sides by 2\pi gives us r = 5. The area of a circle is given by the formula A = \pi r^2. Substituting 5 for r gives us A = \pi (5)^2 = 25\pi.