Area - Inside!: Squares, Rectangles, and Triangles

Contributor: Briana Pincherri. Lesson ID: 11302

Would you like the "inside" scoop on an important "area" of geometry? A video and online practice will show you how to find how many squares fit inside a triangle and what a tiny floating "2" means!


Plane Geometry (2D)

learning style
personality style
Lion, Otter
Grade Level
Middle School (6-8)
Lesson Type
Quick Query

Lesson Plan - Get It!

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Aunt Sally just called and said she needs new carpet at her house.

  • Can you help her figure out just how much flooring to order?

We don't want her to go over and have to pay too much, or go under and not have enough! After this lesson, you should be able to give her an exact answer!

Now, maybe you have an Aunt Sally and maybe you don't. Regardless, there will come a time when you have to calculate how much space is inside of something.

For example, you will at some point need to find either area for 2D (flat) shapes, or volume for 3D shapes. This lesson will focus on the concept of finding area.

Area is the size of surface — you can think of area as the measurement INSIDE of a shape.

Pause to consider perimeter and area. These two often get confused, so let's review the difference between the two measurement terms before we get started.

  • Do you know what the difference is between perimeter and area?

If you need to review this series' first lesson on perimeter, find it under Related Lessons in the right-hand sidebar.

If you said perimeter is the distance around the OUTSIDE of a shape, and area is the measurement INSIDE of the shape, then you are correct!

Think of perimeter as a fence AROUND a property, and the area is the entire yard INSIDE of that fence. Take a minute and picture that in your mind. Hopefully, it will help you keep area and perimeter straight.

So, let's jump right over the perimeter fence and into the area of the yard now.

Learn more about measuring this space by watching Math Antics – Area by Math Antics:

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Once you finish the video, go ahead to the Got It? section, where we will review the area formulas presented in the video.

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