Arc Tool
Ribbon menu → Bodies Tab → Construction container → Arc Tool 
or
(Classic) Build → Bodies/Geometry → Arc Tool 
Creates arcs and circles centered about a location. You begin drawing an arc by specifying its starting and ending angles. You then indicate its center location and set its radius and the orientation of its x-axis. You can also specify the arc’s radius before you draw it. The Arc tool draws the angle starting from the x-axis that you specify and moving counterclockwise (right-hand rule).
See Elements of an arc.
Before you create arc geometry, you can select to create a new part consisting of the arc geometry or add the arc geometry to an existing part or ground. If you create a new part, it has no mass since it is composed of only wire geometry. You can extrude a circle into solid geometry that has mass. Learn about Extruding Construction Geometry Along a Path.
Learn about Creating Arcs and Circles.
For the option: | Do the following: |
|---|---|
New Part/ Add to Part/ On Ground | Select either: ■New Part - Creates a new part. ■Add to Part - Adds the arc to another part in your model. ■On Ground - Adds the arc to ground. Note: Add geometry to ground if the geometry does not move or influence the simulation of your model. For example, if you are simulating a car driving around a race track, the geometry that defines the race track can be added to ground. |
Radius | Enter the radius of the arc |
Start Angle | Enter the angle at which to start the arc. The default is to create a 90-degree arc from a starting angle of 0 degrees. |
End Angle | Enter the angle at which to end the arc. |
Circle | Select to create a circle. |