High School Mathematics 4.13 Surface Area of a Sphere - I

Example:
Find the surface area of the sphere of radius 7 cm. Solution: Surface area of the sphere = 4 * pi * r^{2}
Given that,
r = 7 cm.
Area = 4 * 22/2 * 7 * 7
= 616 Sq. cm.

Directions: Solve the following problems. Also write at least 5 examples of your own.