Developing Drawing Strategies: Part 2 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 222

Object Snap Tracking, and Dynamic Input buttons should be in their on positions.
The rest of the buttons should be off. Follow these steps:
1. Make sure 05A-FPLAY6.dwg is open.
2. Verify that Polar Tracking, Object Snap, Object Snap Tracking, and
Dynamic Input are turned on. The remaining drawing modes should
be turned off.
3. Enter Z ↵ E ↵ or click the Zoom Extents button to zoom to the draw-
ing's extents. Then use the Zoom Window or the scroll wheel to view
the bathroom close-up.
4. Start the RECTANGLE command and use the following settings:
a. For the first point, move the cursor to the lower-right inside
corner of the room. As soon as Endpoint osnap marker appears
on the endpoint you want to snap to, click.
This places the first corner of the rectangle at the endpoint.
b. For the second point, enter -40,40 ↵ ( -1016,1016 ↵ ).
TIP remember, if you are not using Dynamic Input, you need to enter
the @ symbol before entering relative coordinates.
If you are not using Direct Input and don't get the rectangle you want after
entering the relative coordinates for the second corner, click the Options
button at the bottom of the application menu to open the Options dialog
box. Click the User preferences tab.
In the upper-right corner in the priority For Coordinate Data entry area, be
sure that the button next to Keyboard Entry Except Scripts is active, and
then click OK. Try the rectangle again.
5. Start the LINE command, and move the cursor near the midpoint of
the top line of the rectangle.
Notice that a triangle, the Midpoint osnap marker, appears when
you get near the midpoint of the line. When you see the triangle on
the midpoint you want, click.
6. Move the cursor near the midpoint of the left side of the rectangle
until you see the triangle appear at the midpoint location (see
Figure 5.64).
Click again. Press ↵ to end the LINE command.