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Geometry for Kids6 chapters | 45 lessons

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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.

Did you know that the prefix ** hemi-** means 'half,' and a

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.

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.

In fact, sometimes you have to find the **surface area of a hemisphere**, which is the sum of the areas of all the shapes that cover the surface of the hemisphere. For example, let's say that you wanted to wrap a hemisphere-shaped object with wrapping paper. In order to figure out how much wrapping paper you'll need, you'll need to know the surface area.

Sometimes in math classes like algebra or geometry, you'll also be tasked with learning the **volume of a hemisphere**, which is the amount of space inside a hemisphere-shaped object. One way to understand the difference between surface area and volume is to compare it to the human body. The amount of skin needed to cover the body is the surface area, while the insides, such as the organs, bones, and blood, are the volume.

Let's review.

Hemispheres are all around us. In math, a **hemisphere** is defined as a three-dimensional shape that's half of a sphere with one flat, circular side. A **sphere**, on the other hand, is a nearly perfectly round three-dimensional shape. When you're studying geometry, you'll learn how to calculate the **surface area** and **volume** of a hemisphere as well as many other shapes.

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Geometry for Kids6 chapters | 45 lessons

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