Arc

The arc command draws a portion of a circle. Arcs can be defined using many options as you can see in the Draw ⇢ Arc menu. However, the two most relevant options are drawing arcs using 3 points, or using a start point, end point and a radius.


The 3 point option is useful when you do not know the radius, but know three points along the radius’s path takes.


One thing to keep in mind is that arc start points and end points are drawn counter clockwise. Remember this when you create an arc, otherwise it may be concave instead of convex or vice versa.


Arc Quick Reference

Command

arc

Alias

a

Menu bar

Draw ⇢ Arc⇢ Choose option

Important Options

Menu Bar:

Draw ⇢ Arc ⇢ 3 Points - Specify three points which the arc will pass through.

Draw ⇢ Arc ⇢ Center, Diameter - Specify the center and then the diameter.


Command Window:

(The default option is to specify 3 points: start, through and end)

Center - Specify the center, then a start and end point.

Command Window Examples

(remember to type the spaces into the command window)

Draws an arc using three points:

: arc <select 3 points using mouse>

 


Draws arc with center, start, & end points: 

: a c <select start/end points using mouse>