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Math for Kids23 chapters | 325 lessons

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Lesson Transcript

Instructor:
*Nola Bridgens*

Nola has taught elementary school and tutored for four years. She has a bachelor's degree in Elementary Education, a master's degree in Marketing, and is a certified teacher.

What do squares, rectangles, and right triangles have in common? They all contain at least one right angle! This lesson will describe what a right angle is and discuss shapes that contain them.

Are you ready to explore shapes with right angles? Right angles can be found in some of the most common shapes that you see every day! Squares, rectangles, and right triangles all have right angles. In this lesson, we are going on a scavenger hunt to search for items that have right angles. Before we get started, let's define a right angle.

A **right angle** is an angle that measures exactly 90 degrees, where the two sides of the angle sit perpendicular to one another. This image shows what a right angle looks like:

Right angles are found in squares, rectangles, right triangles, and some quadrilaterals. This image shows examples of shapes that have right angles:

Count how many right angles are on a post-it note. A post-it note is a square, and all squares have four right angles! A square is a shape with four sides that are exactly the same length and four right angles.

Keep looking. What else do you see that is a square? Walk into a bathroom in your house. Are there square tiles on the floor or in the shower? What about on the kitchen floor or countertop? Tiles are in the shape of a square if they have four right angles and four equal sides.

Let's switch it up and start looking for some rectangles.

Before you get up to look, what shape is the screen that you are looking at right now? A rectangle! Look at your computer or tablet and count how many right angles you see. You should count four right angles. This is because the screen is a rectangle, and a rectangle is a four-sided shape with four right angles.

Look around for more rectangles! Do you see a piece of paper anywhere? A piece of notebook paper is a rectangle with four right angles. Tables are often rectangles, look for those angles. If it's curved, your table is likely circular and not a rectangle.

Do you like to eat Pop-Tarts for breakfast? No matter what flavor you like, guess what shape a Pop-Tart is? You guessed it, a rectangle!

We have found several items that are in the shape of a rectangle, so let's move on to the next shape on our list.

What other breakfast food can you think of that is in the shape of a right triangle? What about a turnover? A turnover is in the shape of right triangle with one right angle.

A right triangle is a three-sided shape with one right angle and two acute angles. An **acute angle** is an angle that measures less than 90 degrees.

Great job finding all those items in the shapes of squares, rectangles, and right triangles on our scavenger hunt!

We explored the many shapes that contain **right angles**, angles that measure exactly 90 degrees, such as squares, rectangles, and right triangles. We also learned that right angles are all around us in common items we use every day, such as computers and notebook paper. A right triangle has one right angle and two **acute angles**, or angles that measure less than 90 degrees.

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Math for Kids23 chapters | 325 lessons

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