
Create the points needed to define the plane using Insert > Control Point, Insert > Topological Points, or other geometric construction point interfaces.
Control Point in the Common User's Guide

Click PlaneByPoints on the Geometric Construction Palette.

Select the first point.

Select the second point.

Select the third point.
A preview of the plane displays. Each point is a vertex of the plane.

Click Continue.
Temporary geometry displays in the graphic view and as PlaneByPoints in the Geometric Construction Explorer.

If needed, create additional geometric constructions.

Click Close to return to the main command ribbon.
The geometric constructions are not created and saved to the model until you click Finish on the main command ribbon to create the model object.