Chapter 6 Basic Geometric Constructions 169
Constructing Angles
Angles are important geometric ele-
ments. The different types of angles and the
symbols and terms used to describe them are
illustrated in Figure 6-11. There are a number
of drafting procedures used to make angular
constructions. These are discussed in the fol-
lowing sections.
Divide a Line Into a
Given Number
of Equal Parts Using the
Divide Command
1. Line AB is given and is to be divided
into seven equal parts, Figure 6-10A.
The
Divide
command is used for this
procedure.
2. Enter the
Divide
command, select the
line, and specify the number of divisions
as seven. Point markers are displayed
to represent the divisions, Figure 6-10B.
If markers are not displayed, use the
Pdmode
command or the
Point Style
dialog box to change the point style to
the appropriate setting.
CAD
Figure 6-10. Using the Divide command to divide a
line into an equal number of segments.
A B
Figure 6-11. Symbols and terminology used to describe angles and angular constructions. A—Symbols related
to angles and geometric constructions. B—The different types of angles.
Angle symbol Right angle Acute angle Obtuse angle Triangle symbol
Right angle
symbol
Perpendicular
symbol
Complementary
angles
ºA + ºB = 90–
Supplementary
angles
ºA + ºB = 180–
A B
A
B
B
A
More than
90–
Less than
90–
90–