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10.13: Faces, Edges, and Vertices of Solids

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Have you ever been to a craft store?

Instead of quilting, Jillian and her mother went to the craft store after dinner. Jillian wanted a new box to use as a jewelry box.

"I'll get the box and then decorate it," she told her mother.

Jillian found the following box at the craft store.

"This cube is perfect," Jillian said putting into her basket.

The cube, like all solid figures is made up of different parts. Do you know what those parts are?

In this Concept, you will learn how to identify the different parts of a solid figure. Then we will come back and identify the parts of the cube.

Guidance

In the last Concept, you learned to identify different types of solid figures. We referred to the “sides of the figure” and to the “bases of the figure.” Well, there are different parts of each solid and knowing the names of these parts can help us with identifying them.

Three Parts of a Solid

  1. Faces
  2. Edges
  3. Vertices

These three parts are relevant to any solid that has flat surfaces, places where flat surfaces intersect and places where planes intersect.

Let’s define each part.

Face – any flat surface

The flat surface that makes the front of this cube is called a face. Many solid figures have more than one face.

Edge – The line segment where two faces meet. You can see by looking at this cube that the faces intersect in a line. That line is called an edge.

Many solid figures have more than one edge.

Vertex – a point where several planes meet in a point.

The arrow here is pointing to a vertex of this cube. Many solids have more than one vertex, we call those vertices .

Let’s look at identifying the number of faces, edges and vertices of different solids.

Here is a square pyramid.

I know this seems confusing. Think about it as if you were looking down on the pyramid. Now let’s look at the faces, edges and vertices.

The faces are the triangle sides and the square bottom. Given this, there are 5 faces in this pyramid.

The edges are where two flat surfaces meet in a line segment. Given this, there are 8 edges in this pyramid.

Faces come together at a vertex. There are five vertices in this pyramid.

Now answer the following questions about solid figures.

Example A

What do we call the points on a solid figure?

Solution: We call those vertices.

Example B

What do we call the place where two faces meet?

Solution: We call that an edge.

Example C

What are the flat sides of a figure called?

Solution: The faces

Here is the original problem once again.

Instead of quilting, Jillian and her mother went to the craft store after dinner. Jillian wanted a new box to use as a jewelry box.

"I'll get the box and then decorate it," she told her mother.

Jillian found the following box at the craft store.

"This cube is perfect," Jillian said putting into her basket.

The cube, like all solid figures is made up of different parts. Do you know what those parts are?

Every solid figure has several faces. We can count the number of faces the figure has. How many faces does each figure above have?

It has a face on the bottom and on the top. It has four faces around the sides. Therefore it has six faces in all.

The places where the faces meet is called an edge. This figure has 12 edges.

It has eight points too, and we call those points "vertices."

Vocabulary

Here are the vocabulary words in this Concept.

Plane Figure
a flat two-dimensional figure.
Solid Figure
a three-dimensional figure with height, width and depth.
Prism
a solid with two parallel congruent bases.
Cylinder
a solid with two parallel congruent circular bases.
Pyramid
a polygon for a base and triangular faces that meet at one vertex.
Cone
a solid with a circular base and one vertex
Sphere
a three-dimensional circular solid
Face
any flat surface on a solid figure
Edge
when two faces meet in a line segment. The line segment is the edge.
Vertex
when three or more faces meet at a single point.

Guided Practice

Here is one for you to try on your own.

How many edges, faces and vertices are there in this figure?

Answer

In this pyramid, there are five vertices, five faces and eight edges.

Video Review

Here is a video for review.

TenMarks: Polyhedrons - Faces, Vertices, Edges

Practice

Directions : Identify the part of each solid indicated by the arrow.

1.

2.

3.

Directions : Answer each question.

4. Define face.

5. Define edge.

6. Define vertex.

7. How many edges in a cube?

8. Which plane figures make up the faces of a square pyramid?

9. Which plane figures make up the faces of a rectangular prism?

10. How many vertices are there in a triangular pyramid?

Directions : Identify each figure.

11.

12.

13.

14.

15.

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Difficulty Level:

Basic

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Grades:

Date Created:

Oct 29, 2012

Last Modified:

Aug 18, 2014
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