# Question Video: Identifying Vertices of 2D Shapes Mathematics • 1st Grade

Which of the given shapes has 5 vertices?

02:45

### Video Transcript

Which of the given shapes has five vertices?

In this question, we’re given four different 2D shapes to look at. And the question asks us which of them has five vertices. Now we’re not going to be able to answer this question unless we know what the word vertices means. What are the vertices of a shape?

Well, we know one thing they’re not. They’re not the straight lines that make up a shape. These are the shape’s sides, not vertices. Vertices are the corners of a shape where two sides meet. Do you recognize our first shape? It’s a rectangle, isn’t it? How many vertices does this shape have? One, this is the corner where these two sides meet. Two, this is the corner where these two sides meet. Three, so you can see each of these vertices is a place where two sides meet. And then finally, there’s one more corner at the top.

Our rectangle has four corners. Using our special word for corners, we could say it has four vertices, so it’s not the shape we’re looking for. What about the next shape? Do you recognize this one? It’s a triangle, isn’t it? How many vertices does a triangle have? We can see one, two, three vertices. The triangle isn’t the shape we’re looking for either. The next shape is an interesting one. Let’s see whether this has five corners. One, two, this is an interesting one. It doesn’t stick out like all the other corners, does it? But remember, a vertex is the corner of a shape where two sides meet. And this is a point where two sides meet.

Just because it’s not sticking out doesn’t mean it’s not a corner. Three, four, five, six. This shape has one too many vertices. It has six vertices, not five. It looks like our last shape must be the right answer. Let’s count to see whether it has five corners. One, two, three, four, five. This shape has five vertices. We know that the vertices of a shape are its corners. And so the correct shape is the one that has five corners. It’s this shape.