Draw tools, Object Snap and Dynamic Input - Introduction to AutoCAD 2011: 2D and 3D Design - page 59

Fig. 3.13 First example - Osnaps
Specify radius of circle: 60
Command: enter l (Line) right-click
Specify fi rst point: enter qua right-click
of pick near the upper quadrant of the circle
Specify next point: enter cen right-click
of pick near the centre of the circle
Specify next point: enter qua right-click
of pick near right-hand side of circle
Specify next point: right-click
Command:
N o t e s
With Object Snaps off, the following abbreviations can be used:
end - endpoint;
mid - midpoint;
int - intersection;
cen - centre;
qua - quadrant;