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Math for Kids23 chapters | 325 lessons

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Instructor:
*Mark Boster*

When trying to fit one thing into another, it is important to know dimensions. If you don't measure the directions correctly, the items might not fit the way you want them to. Be sure to measure all three ways so you are sure everything will be okay.

Tammy wanted to get a doghouse for her dog, Chi Chi, to live in. The doghouse was going to go in the backyard. She thought that was a good place for the doghouse because there was a high fence around the yard so Chi Chi couldn't get out.

Tammy and her father went to the store, bought a doghouse, and brought it home. It was a beautiful doghouse, but the problem was it wouldn't fit through the gate to get it into the backyard! It was too bad that Tammy didn't know about dimensions, or she could have avoided this problem.

Tammy might have been able to get Chi Chi's doghouse in the backyard if she had measured how wide the gate was and bought a house that would fit. When she measured the width of the gate, she would have measured one dimension. A **dimension** is the distance in one direction, in this case, width. There are other dimensions in math; let's check them all out.

There are three dimensions in math; length, width, and height. Length is like measuring a piece of string: there is only one way to measure it. You can only measure it from one end to the other. A straight line on a piece of paper is another example of length. A line is one-dimensional.

The second dimension is width. If you look at a piece of paper, you can measure how long the paper is, but you can also measure how wide it is. If you only can measure an object's length and width, it has to be a flat surface. In math, we call this flat surface a **plane figure** because it can be drawn on a plane, an imaginary flat surface that goes on forever in both directions. A square is called two-dimensional because it can only go two ways: width and length.

The third dimension in math is height. Take a look at a box. You can measure how long a box is, how wide it is, and how tall it is, which makes it three-dimensional. Since this box takes up space, we call it a **space figure**.

In math, a **dimension** is the distance in one direction. Chi Chi's doghouse has three dimensions; length, width, and height. Since the doghouse takes up all three dimensions and takes up space, it is called a **space figure**. If the doghouse were flat, it would only have two dimensions and be called a **plane figure**.

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7 in chapter 10 of the course:

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Math for Kids23 chapters | 325 lessons

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- Definition of Like Denominators
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- What is an Element in Math?
- Equation Lesson for Kids: Definition & Examples 3:49
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- Integers Lesson for Kids
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