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.
