Video Transcript
Vertices of 3D Shapes
In this video, we’re going to learn
how to build 3D shapes and how to count the number of vertices a 3D shape has.
A class are making 3D shapes using
gumdrops and toothpicks. Can you tell what shape it’s going
to be? It’s a cube. They used cocktail sticks for the
edges of this cube. And for this corner or vertex, they
used a gumdrop. We use the word “vertex” to
describe one corner. The cube used eight gumdrops. It has eight vertices. They made a square-based
pyramid. Again, they used cocktail sticks
for the edges and gumdrops for the vertices. They also built a rectangular prism
or a cuboid. Building shapes like this is a good
way to learn about edges and vertices. In this video, we’re going to
practice counting the number of vertices 3D shapes have. Remember, a vertex is the point
where two or more lines meet. Let’s practice counting the number
of vertices that 3D shapes have.
How many vertices does the shape
have?
A vertex is the place where two or
more edges meet. Here’s one vertex. We need to count all the
vertices. There are four vertices on the base
of this shape and another four at the top, giving us a total of eight vertices. This shape has eight vertices.
How many vertices does the shape
have?
A vertex is the point where two or
more edges meet. Let’s count the number of vertices
this shape has. Here’s one, two, three, four,
five. The shape has five vertices.
True or false: The two given shapes
have the same number of vertices.
We have to decide if this statement
is true or false. Do the given shapes have the same
number of vertices? Let’s start by marking and counting
the vertices on the first shape. A vertex is the place where two or
more edges meet. Here’s one, two, three, four, five,
six, seven, eight. This shape has eight vertices. Now, we need to count and then
compare the number of vertices on the second shape. One, two, three, four, five,
six. The two given shapes don’t have the
same number of vertices. Our first shape has eight vertices,
and the second has six. The statement which says that both
shapes have the same number of vertices is false because each shape has a different
number of vertices.
What have we learned in this
video? We have learned how to build some
3D shapes. We used cocktail sticks for the
edges. And where the edges meet, we used a
gumdrop as a vertex. We’ve learned that a vertex is the
point where two or more edges meet. And we’ve learned to count the
number of vertices a 3D shape has. And we’ve learned to count the
number of vertices a 3D shape has. Why not try building some 3D shapes
of your own? You could use cocktail sticks for
the edges and gumdrops, jelly beans, or marshmallows for the vertices.
