174 Section 2 Drafting Techniques and Skills
4. With a radius equal to the length of Side B,
draw another circle that intersects the
first circle. The circle will have the same fi
radius as Arc B in Figure 6-19C.
5. Draw the sides to form the required
triangle. Refer to Figure 6-19D. Use
the
Line
command with the Endpoint
and Intersection object snaps. The sides
should meet where the circles intersect.
Construct a
Triangle with
Three Side Lengths Given
CAD
Using a Compass
(Manual Procedure)
1. Side lengths A, B, and C are given,
Figure 6-19A.
2. Draw a base line and lay off one side
(Side C in this case), Figure 6-19B.
3. With a radius equal to one of the remain-
ing side lengths (Side A in this case), lay off
an arc using a compass (Arc A in this case).
4. With a radius equal to the remaining side
length (Side B in this case), lay off an arc
that intersects the first arc (Arc B in this fi
case), Figure 6-19C.
5. Draw the sides to form the required
triangle, Figure 6-19D.
Using the Line and Circle
Commands (CAD Procedure)
1. Side lengths A, B, and C are given. Refer
to Figure 6-19A.
2. Enter the
Line
command and draw a base
line the length of Side C. Enter coordinates
to specify the length and direction or use
Ortho mode and direct distance entry.
3. Enter the
Circle
command and draw a circle
with a radius equal to the length of Side A.
Locate the center point at the endpoint of
the base line. The circle will have the same
radius as Arc A in Figure 6-19B.
Figure 6-19. Constructing a triangle from three given side lengths.
A
A
A B
B
C
C
B
C
C
D
C
A B
Using a Compass
(Manual Procedure)
1. Sides A and B and the included angle are
given, Figure 6-20A.
2. Draw a base line and lay off one side
(Side B), Figure 6-20B.
3. Construct the given angle at one end of
the line and lay off the other side (Side A)
at this angle using a compass.
4. Join the end points of the two given lines to
form the required triangle, Figure 6-20C.
Construct a
Triangle with
Two Side Lengths and
Included Angle Given
CAD