Dimensioning a Drawing - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 614

Placing Dimensions on the Drawing
Upon returning to your drawing, it should still look almost exactly like Figure 12.1
(shown earlier), and it should have the following:
A new layer called A-ANNO-DIMS, which is current
A new dimension style called -A-DIMS-PLAN, which is current and is
now displayed in the drop-down list on the Dimensions panel
Most of the layers frozen
The Endpoint osnap running (other osnaps may be running, but only
Endpoint is important to this exercise)
On the status bar: Ortho Mode, Polar Tracking, and Object Snap
Tracking off
A new text style called A-DIMS, which is current
Placing Horizontal Dimensions
First, you'll dimension across the top of the plan, from the corner of the building
to the closet wall, and then to the other features on that wall. Then you'll dimen-
sion the decks and roof.
1. Continue using 12A-FPLAY1.dwg and zoom into the area around the
closet.
2. Click the Linear Dimension button at the left side of the Dimensions
panel on the Annotate tab to activate the DIMLINEAR command.
If the Linear Dimension button isn't visible, click the down arrow
below the current dimension command and then choose Linear from
the drop-down list. The prompt says Specify first extension
line origin or <select object>: .
3. Pick the upper-right corner of the cabin walls. The prompt changes
to Specify second extension line origin: .
4. Activate the Perpendicular osnap, place the cursor over the outside of
the closet wall as shown in Figure 12.21, and then click.
5. At the Specify dimension line location or: prompt, click a point
above the roof line to place the dimension in the drawing (see the
top of Figure 12.22). Also notice that the left extension line starts
perpendicular to the wall you picked.