Surface Area of a Sphere

Common Core Standard  8.G.9

What is a sphere? You can think of a sphere as a circle in three dimensions.

A sphere is perfectly symmetrical, does not have any vertices, corners, or edges. In addition, all of the points on a sphere are the same distance from the center. In Geometry, the surface area is the measure of the total area of a three-dimensional object. If you have a rectangular shoe box, it is the area of all six of the faces of the box added together.

The surface area of a sphere is the total area of the curved surface. You can also think of the surface area as the amount of wrapping paper needed to wrap a 3D object.