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Arc Command.

Command: A (Enter)
ARC

Prompts Under Arc command.

Specify start point of arc: specifies start point of your arc

Specify second point of arc: Specfies seond point of your arc

Specify end point of arc: Specifies third point i.e End point of your arc.

Center: specifies the center point of your arc, after the first point has been specified.

End: This will allow you to specify the end point of your arc after specifying the first point.

Prompts Under Center option of arc:

Angle: Specify your included angle of arc in anticlockwise direction. Arcs are traced in anticlockwise direction, to make an arc in clockwise direction press ctrl. even when you are making arc in clockwise direction, specify included angles in anticlockwise direction only. 

Chord length: Specify the chord length of your arc. chord length of arc will decide the included angle of the arc

Prompts Under End option of arc:

Angle: Specify your included angle of arc in anticlockwise direction. Arcs are traced in anticlockwise direction, to make an arc in clockwise direction press ctrl. even when you are making arc in clockwise direction, specify included angles in anticlockwise direction only. 

Direction: This will specify a tangential direction to arc at the start point of arc.

Radius: Specifies the radius of your arc and completes the arc from point 1 to point 2. If radius is negative major arc is created.

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