Video Crash Courses
Want to watch animated videos and solve interactive exercises about finding the surface area of spheres?
Now it’s time to learn how to find the volume and the surface area of spheres.
Imagine an inflated beach ball. It consists of a thin plastic cover filled with air. The surface area of the ball is then equal to the area of the plastic cover of the beach ball. Here you’ll learn to find the surface area of a sphere.
Example 1
What is the surface of a sphere with a radius of ?
Example 2
What is the surface area of a sphere with a diameter of ?
The first thing you need is the radius. It’s half the diameter, which makes it
Thus, the surface area is
Video Crash Courses
Want to watch animated videos and solve interactive exercises about finding the volume of spheres?
Formula
The volume of a sphere is a measure of how much can fit inside the sphere. So for example, a beach ball’s volume tells you how much air needs to be blown into the ball to fill it up. This formula may look a little scary, but it’s easy to use. You need to learn the formula and know how to use it. The volume unit is raised to the power of 3.
Example 3
Find the volume of a sphere with a radius of
Rule
Example 4
How many liters does a sphere with a radius of hold?
That is, the sphere holds about L.
Example 5
Find the volume of a hemisphere with a radius of
The first thing we need is the volume of the sphere: