Video: Rectangles

In this video, we will learn how to identify rectangles regardless of their orientation, size, or color.

07:18

Video Transcript

Rectangles

In this video, we will learn how to identify rectangles regardless of their orientation, size, or color.

This is a rectangle. How can we tell? How many sides does a rectangle have? Let’s count them. There’s one, two, three, four. Rectangles have four sides. Here’s another rectangle. Does it have four sides? Yes, it does. What else do we know about rectangles? We know they have four sides.

How many corners do rectangles have? Another word for corner is vertex. Let’s count the number of corners or vertices. We’ve already pointed to one of the corners, two, three, four. Rectangles have four corners. The corners in a rectangle are all the same size. We call these corners right angles. Here’s a rectangle and a square. Are both of these shapes rectangles? They both have four sides. And they both have four corners. And the four corners in each shape are right-angled corners. So, both of these shapes are rectangles.

A square is a special type of rectangle. The sides of a square are equal in length. That means each of the sides is the same length. In this rectangle, the opposite sides are the same length. So, a square is a rectangle. It’s a rectangle that has four sides of equal length. Rectangles can come in different sizes and colors. But all rectangles have four sides and four corners. Let’s try some example questions to practice identifying rectangles using these features.

Select another rectangle.

We’re shown a picture of a blue rectangle. And we have to select another rectangle from the three shapes we’re given. Let’s think about what we know about rectangles. We know that rectangles have four sides and four corners. Does this shape have four sides? Let’s count them. One, two, three. The first shape isn’t a rectangle. It only has three sides.

Our second shape has no sides and no corners. So, it’s not a rectangle either. So, this shape must be the other rectangle. Let’s quickly check the number of sides and corners. One, two, three, four. This shape does have four sides. And it has one, two, three, four corners. It’s a rectangle!

We looked closely at the shapes. We counted the number of sides and corners. And we selected the other rectangle.

Where does this shape belong? Not a rectangle or rectangle?

We’re shown a shape. We have to decide if this shape belongs to the group of shapes which are not rectangles. Or if the shape belongs to the group of shapes which are rectangles. So, we have to decide if this shape is a rectangle. Let’s count the number of sides. We know that rectangles have four sides. Let’s count them.

Here is one, two, three, four. This shape does have four sides. Does it have four corners? One, two, three, four. Yes, it does. It’s a rectangle. It has four sides and four corners. It belongs with the group called rectangles. This is where the shape belongs.

How many rectangles are there?

We’re shown a picture of a cat which has been made from lots of different shapes. We have to count the number of rectangles. What do we know about rectangles? We know that rectangles have four sides and four corners. Is this a rectangle? Yes, it is. It has four sides and four corners. So, there’s one rectangle.

Are the cat’s legs made from rectangles? No, these are triangles. These shapes only have three sides. Is the cat’s body a rectangle? Yes, it is. It has four sides and four corners. This is our second rectangle. And the cat’s face is a rectangle. It has four sides and four corners. We found three rectangles.

The cat’s eyes are made from circles. Its nose is a triangle. These shapes don’t have four sides; they’re not rectangles either. There are three rectangles in the picture.

We’ve learned how to identify rectangles. We’ve learned that rectangles have four sides and four corners. And we also learned that squares are a special kind of rectangle with four equal sides.

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