Lesson Video: Open and Closed Shapes Mathematics • 1st Grade

In this video, we will learn how to identify and draw open and closed shapes.

05:42

Video Transcript

Open and Closed Shapes

In this video, we will learn how to identify and draw open and closed shapes.

An open shape is a shape whose line segments or curves do not meet. The two ends of this shape don’t meet. This is an open shape. This is also an open shape. Its line segments do not meet. We call this a closed shape. Its line segments meet. They’re all connected. If we started drawing at the pink dot and drew all the way around the shape, we’d end up back at the pink dot again. This is also a closed shape because all of its line segments are connected. Let’s try some questions now where we have to practice identifying open and closed shapes.

Is the shape open or closed?

In this question, we’re given a shape. We have to identify whether the shape is open or closed. Let’s draw the shape. It has one, two, three, four sides. We started drawing at this point, and we finished drawing at this point. All of the sides or edges of this shape are connected. Because each of the line segments meet, we call this a closed shape. The shape is closed.

Find the shape that has six sides and is not closed.

We’re looking for the shape which has six sides and not closed. If a shape is not closed, it means it’s open. So, we’re looking for the shape that has six sides and is an open shape. This shape is a closed shape. All of its sides meet. One, two, three, four. We’re back to the point where we started. The line segments are all connected. They all meet. We know this is not the shape we’re looking for. It has four sides, and it’s a closed shape.

We’re looking for a shape with six sides which is open. Two of our three shapes are open. Which one has six sides? Let’s count the number of sides the first shape has. One, two, three, four, five, six. This is the shape that has six sides and is not closed. We know that this shape is not closed. Let’s just check how many sides it has. One, two, three, four, five. We found a shape that has six sides and is not closed.

Is the curve open or closed?

In this question, we’re shown a curved shape. We have to decide if it’s open or closed. An open curve is a curve which doesn’t meet. This is an open curve. The start and end points don’t meet. Let’s try to draw the given curve. The pink dot is our start point. And we can draw from the start point all the way around the curve back to the start point again. The curve is connected. The start and end point are the same. This curve is a closed curve.

Is the shape of the number two an open curve?

In this question, we’re asked if the number two is an open curve. Let’s draw a number two. This is our start point. We go all the way around. Our end point is here. These two points don’t meet. Our curve is not connected. So, the answer to the question “is the shape of a number two an open curve?” is yes, the number two is an open curve.

What have we learned in this video? We have learned how to identify and draw open shapes or figures and closed shapes.

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