LESSON
Three-Dimensional Figures
10-6
Lesson Objectives
Name three-dimensional figures
Vocabulary
polyhedron (p. 566)
face (p. 566)
edge (p. 566)
vertex (p. 566)
prism (p. 566)
base (p. 566)
pyramid (p. 567)
cylinder (p. 566)
cone (p. 567)
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Holt Mathematics
LESSON
Three-Dimensional Figures
10-6
Lesson Objectives
Name three-dimensional figures
Vocabulary
polyhedron (p. 566) A three-dimensional object in which all the flat surfaces or
faces are polygons.
face (p. 566) A flat surface of a polyhedron.
edge (p. 566) The line segment along which two faces of a polyhedron intersect.
vertex (p. 566) The point on a polyhedron at which three or more faces meet; on
a cone or pyramid, the top point.
prism (p. 566) A polyhedron that has two congruent, polygon-shaped bases and
other faces that are all parallelograms.
base (p. 566) A face of a three-dimensional figure by which the figure is
measured or classified.
pyramid (p. 567) A polyhedron with a polygon base and triangular sides share a
vertex.
cylinder (p. 566) A three-dimensional figure with two parallel, congruent circular
bases connected by a curved lateral surface.
cone (p. 567) A three-dimensional figure with one vertex and one circular base.
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All rights reserved.
251
Holt Mathematics
LESSON 10-6 CONTINUED
Additional Examples
Example 1
Identify the number of faces, edges, and vertices on each threedimensional figure.
A.
faces
edges
vertices
B.
faces
edges
vertices
Example 2
Name the three-dimensional figure represented by each object.
A.
There is a
surface.
The figure is not a
.
There are two
,
bases.
The bases are
.
The figure represents a
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
252
.
Holt Mathematics
LESSON 10-6 CONTINUED
Additional Examples
Example 1
Identify the number of faces, edges, and vertices on each threedimensional figure.
A.
B.
5
faces
8
edges
5
vertices
7
faces
15
edges
10
vertices
Example 2
Name the three-dimensional figure represented by each object.
A.
There is a curved
surface.
The figure is not a polyhedron
.
There are two congruent
parallel
,
bases.
The bases are circles
.
The figure represents a cylinder
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
252
.
Holt Mathematics