Chapter 6 Basic Geometric Constructions 167
3. Using Points F and G as centers and the
same radius as Arc FG, strike intersect-
ing arcs at Point H.
4. Draw Line PH. This line is perpendicular
to Line DE.
Using the Perpendicular Object
Snap (CAD Procedure)
1. A line perpendicular to Line AB and
passing through Point P is to be drawn.
Refer to Figure 6-7A.
2. Enter the
Line
command. Specify Point P
as the fi rst point. fi
3. For the second point, select the
Perpendicular object snap and snap to
Line AB. A line is drawn perpendicular
to Line AB.
Draw a Line
Through a
Point and Perpendicular to
a Given Line
CAD
Using a Triangle and T-Square
(Manual Procedure)
1. Line AB and Point P are given, Figure 6-7A.
A line perpendicular to Line AB and
passing through Point P is to be drawn.
2. Place the triangle so that its hypotenuse
is on the T-square. Position the T-square
and the triangle so an edge of the
triangle lines up with Line AB.
3. Without moving the T-square, slide the
triangle so its other edge is in line with
Point P.
4. Draw Line PC. This line is perpendicular
to Line AB.
Using a Compass
(Manual Procedure)
1. Line DE and Point P are given, Figure 6-7B.
A line perpendicular to Line DE and
passing through Point P is to be drawn.
2. With Point P as the center and using
any convenient radius, strike Arc FG.
This arc should intersect Line DE at
two places. These intersections become
Points F and G.
Figure 6-7. Drawing perpendicular lines. A—Using a
T-square and triangle. B—A compass can also be used.
A
C
D
F
G
E
H
P
B
P
A B