The area of the surfaces of the object is called its surface area. Move a ring around the sphere from one end to the other. Measure the position of the ring by angle. By taking the angle from zero to $\pi$ radians, the ring will cover the entire area of the sphere's surface. The surface area of the sphere is exactly four times the area of a great circle of the sphere. Great circle is the intersection of the plane passing through the center of a sphere and the the sphere. Any sphere has an infinite number of great circles.

The surface area of a sphere can be found by the** formula:**

**Surface Area =** **4$\pi r^2$**

Where 'r' is the radius of the sphere.