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Shapes with Right Angles

Shapes with Right Angles
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  • 0:03 Time for a Scavenger Hunt
  • 0:23 Definition
  • 0:37 Squares
  • 1:10 Rectangles
  • 1:58 Right Triangles
  • 2:25 Lesson Summary
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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.

Time for a Scavenger Hunt!

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.

Definition

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:


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


shapes


Squares

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.

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.

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