Basic 2-Dimensional Entities for DRAW Menu in CAD Software Part I

1 Draw Menu
1.1 LINE : A line is specified by giving its two end points. At the command prompt, enter LINE
From point : Specify a point
To point : Specify a point
To point : Press enter to terminate the LINE command

1.2 CIRCLE : 
Four methods : (1) Center point and radius
(2) Two point circle
(3) Three point circle
(4) (a) Tangent Tangent Radius (TTR)
       (b) Tangent Tangent Tangent Circle (TTT)

Center-radius method
At the command prompt, enter CIRCLE
3P / 2P / TTR / <Center point> : Click where one intends the center point to be

Diameter / <Radius> <current> : Drag with mouse and click at appropriate point to define radius

1.3 ARC :
The arc is a curve specified by center and radius as well as other parameters.

There are several methods used for drawing an arc.
(1) 3 points
(2) Start point, Center Point, End Point
(3) Start point, Center Point, Angle of Inclusion
(4) Start point, Center Point, Length of chord
(5) Start point, End Point, Angle of Inclusion
(6) Start point, End Point, Direction
(7) Start point, End Point, Radius

The default used to execute ARC command is 3-point arc.

At the command prompt, enter ARC
Center / <Start point> : press enter

Note: 
By default, AutoCAD draws arcs in the CCW (Counter Clockwise Direction).

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