Find Out Things About Right Spheres

Notes about spheres:

• The radius R, or the distance from the center of a sphere to its edge, is usually the defining property of a sphere.
• The diameter, or the distance across a sphere that passes through the center of the sphere is 2R (twice the radius).
• The surface area of a sphere is 4R².
• The volume enclosed by a sphere is ⁴/₃R³.
• Note that =3.1415926535...