Chapter 6 Basic Geometric Constructions 175
Figure 6-20. Constructing a triangle from two side lengths and the included angle.
A
30–
A
B
A B
B
C
C
A
B
30–
Using the Line Command
(CAD Procedure)
1. Sides A and B and the included angle are
given. Refer to Figure 6-20A.
2. Enter the
Line
command and draw a base
line the length of Side B. Enter coordi-
nates to specify the length and direction
or use Ortho mode and direct distance
entry.
3. Enter the
Line
command and draw a line
the length of Side A from the endpoint
of the base line. Draw the line at 30° (the
included angle). Use polar coordinates or
polar tracking and direct distance entry.
4. Enter the
Line
command and use the
Endpoint object snap to join the end
points of the two lines to form the
required triangle. Refer to Figure 6-20C.
Figure 6-21. Constructing a triangle from two angles and the included side length.
A
A B
B
A
30–
B
A B
Given side
C
C
A B
30–
45–
45–
Construct a
Triangle with
Two Angles and Included
Side Length Given
CAD
Using a Protractor
(Manual Procedure)
1. Angles A and B and the included side
length are given, Figure 6-21A.
2. Draw a base line and lay off Side AB,
Figure 6-21B.
3. Using a protractor, construct Angles A
and B at the opposite ends of Line AB.
4. Extend the sides of Angles A and B until
they intersect at Point C, Figure 6-21C.
Triangle ABC is the required triangle.