# What is a Hemisphere in Math? - Definition & Example

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• 0:04 What Is a Hemisphere?
• 0:25 Real-World Examples
• 1:30 Hemispheres in Math
• 2:24 Lesson Summary

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Lesson Transcript
Instructor: Mary Beth Burns

Mary Beth has taught 1st, 4th and 5th grade and has a specialist degree in Educational Leadership. She is currently an assistant principal.

A hemisphere is a shape that you'll need to know in your mathematics classes. In this lesson, you'll learn what a hemisphere is and look at some real-world examples of this three-dimensional shape.

## What Is a Hemisphere?

Did you know that the prefix hemi- means 'half,' and a sphere is a three-dimensional shape that is perfectly round, like a basketball or a marble? So, what does the word 'hemisphere' mean? Well, a hemisphere is a three-dimensional shape that is half of a sphere with one flat, circular side, which also known as a face.

## Real-World Examples

If you look around, you'll find hemispheres all around you. Let's think about a grocery store. There are many spheres that could be cut in half to make two hemispheres. A grapefruit cut in half would result in two hemispheres; a cherry cut in half would result in two hemispheres; and a meatball cut in half would result in two hemispheres.

Before we get too hungry though, there are many other non-food examples of hemispheres that are in the real world, including the world itself! The earth is a sphere that can be conceptually divided into two hemispheres: the Northern Hemisphere and the Southern Hemisphere at the equator, and the Eastern Hemisphere and Western Hemisphere at the Prime Meridian.

You also have hemispheres inside of you - that is, inside your head! Your brain is divided into two hemispheres known as the left brain and the right brain, though the brain isn't a true sphere. Did you know that you use these hemispheres in different ways? The left side of your brain is the logical side, and you use this hemisphere to do things like math. The right side of your brain is the creative side, so it's used when making things like art.

## Hemispheres in Math

As a student, you'll take many different types of math classes such as algebra, calculus and geometry, just to name a few! In geometry, you'll study different lines and shapes, including hemispheres.

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