Trim Planar Faces
Insert 
Shapes (Basic)
Use this command to create a planar face trimmed
to a set of bounding curves. Required inputs include the boundary curves
to trim to. Optional inputs include a datum plane or planar face to project
to.
Required
Inputs
Curves
Select the boundary curves. They can be a sketch or wireframe geometry such as lines, arcs, circles or curves. They must all lie on the same plane unless the Plane option is used (see below).
Plane
Select a datum plane or planar face to project the curves onto prior to creating the planar face. The curves must form a closed loop in order to create the planar face. Specify the tolerance used to refit the curves.
