Number
Number of edges
Number of face
Name:
Number of vertices
Number of edges
Curved face
Name:
Number of vertices
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Answers
Answer:Using Faces, Edges, and Vertices to Identify a Solid
Every solid figure, with the exception of a sphere, has one or more faces, or flat surfaces.
Let's look at an example.
[Figure2]
The figure above has a face on the bottom, called the base, and another on the top. It has four faces around the sides. Therefore, it has six faces in all.
The shapes of the faces are rectangles. Since the shape on the bottom and the top are the same, the general category of this shape is called a prism. Prisms are more specifically named by the shape of the base. In this case, the shape of the base is a rectangle; so this solid figure is called a rectangular prism.
Let's look at an example.
[Figure3]
This figure has four faces. The base, or the face on the bottom, is a triangle, and the sides are triangles that meet at a vertex at the top. The general category for this solid figure is a pyramid. Notice that the base of the pyramid is a triangle. The specific name of this soid figure is called a triangular pyramid. As with the prism, the base indicates the specific name of the figure.
You can also identify a solid figure by counting the edges.
An edge is the place where two faces meet. Edges are straight; they cannot be curved.
Let's look at an example.
[Figure4]
Count all of the edges on the solid figure above. This figure has 9 edges.
Cones, spheres, and cylinders do not have any edges because they do not have any flat sides.
The place where two or more edges meet is called a vertex. A vertex is like a corner. If you have more than one vertex they are called vertices. You can also count the number of vertices in order to identify solid figures.
Let's look at an example.
[Figure5]
When you count the number of vertices in the figure above, you see there are 7 vertices. All solid figures that have a vertex at the top are classified as pyramids.
Explanation: