158 Exploring Drafting
Y axis
(2,2)
X axis
Absolute Coordinates
A
Origin
(0,0)
Y axis
(2,2)
(7,6)
X axis
Relative Coordinates
B
5 units
4 units
90°
180°
120°
45° °
1 2 3 4 5 6 7 8 9 10
270°
0°
Polar Coordinates
C
A
B
Figure 7-9 The three common types of coordinate entry used to specify point locations. A—The absolute
coordinate (2,2) is located 2 units along the positive X axis and 2 units along the positive Y axis from the 0,0
origin. B—Entering the relative coordinate (@5,4) locates the next point 5 units along the positive X axis and
4 units along the positive Y axis “relative” to the absolute coordinate (2,2) or at the absolute coordinate (7,6).
C—Polar coordinates are located at a specifi ed distance and angle. Angular values are measured counterclockwise.
Point A represents the polar coordinate entry (545) relative to the origin. Point B represents the polar
coordinate entry (8120) relative to the origin.