Introducing drawing - Introduction to AutoCAD 2011: 2D and 3D Design - page 38

3. Click the Circle tool again and against the fi rst prompt enter t (the
abbreviation for the prompt tan tan radius ), followed by a right-click .
Command_circle Specify center point for circle or
[3P/2P/Ttr (tan tan radius]: enter t right-click
Specify point on object for fi rst tangent of
circle: pick
Specify point on object for second tangent of
circle: pick
Specify radius of circle (50): enter 40 right-
click
Command:
The circle of radius 40 tangential to the two circles already drawn then
appears (Fig. 2.15).

N o t e s

1. When a point on either circle is picked a tip ( Deferred Tangent )
appears. This tip will only appear when the Object Snap button is
set on with a click on its button in the status bar, or the F3 key of the
keyboard is pressed.

2. Circles can be drawn through 3 points or through 2 points entered at
the command line in response to prompts brought to the command line
by using 3P and 2P in answer to the circle command line prompts.

The Erase tool

If an error has been made when using any of the AutoCAD 2011 tools,
the object or objects which have been incorrectly drawn can be deleted
with the Erase tool. The Erase tool icon can be selected from the Home/
Modify panel (Fig. 2.16) or by entering e at the command line.

Fig. 2.16 The Erase tool icon from the Home/Modify panel