Drawing circles and arcs

The CIRCLE command (alias C, on the Draw toolbar, or Draw main menu) creates circles. By default, it prompts for the circle's center point and radius, but other construction options are available. The radius can be specified by value or by point:

: CIRCLE
Options: 3Point, 2Point, Ttr, TTT, Enter to exit or
Specify center point? P1
Default: 15
Options: Diameter or
Specify radius? P2

After specifying the center point, the Diameter option allows the user to define a circle by center and diameter. If the center location is unknown, there are four construction options: 3Point defines a circle from three not collinear points; 2Point defines a circle by two points on diameter; Ttr defines a circle that is tangent to two existing entities and a specified radius; TTT defines a circle that is tangent to three existing entities.

The ARC command (alias A, on the Draw toolbar, or Draw main menu) creates arcs. By default, it prompts for three points, start, through and end.

: ARC
Options: Center, Append, Enter to continue from last point or
Specify start point? P1
Options: Center, End or
Specify through point? P2
Specify end point? P3

There are eleven methods for creating arcs, as can be seen from the Draw | Arc main menu. Basically, each method needs three parameters. The remaining parameters are: Center to define the arc center point; Angle to define the included angle; Length to define the arc chord; Radius to define the arc radius; Direction to define the tangent direction on the first point.