To Create a Rectangular Surface Using Four Points
1. Click > > 
Corners. The 4 Points - Rectangle mathematical properties dialog box opens.
Corners. The 4 Points - Rectangle mathematical properties dialog box opens.2. Holding down the CTRL key, select four points on the faceted geometry. A rectangular surface is created.
3. Define the mathematical properties of the surface:
a. Select a surface type.
b. In the Degree box, type or select a value from 1 to 15.
c. In the Number of segments box, type or select a value from 2 to 200.
d. Click OK to close the 4 Points - Rectangle dialog box.
4. Click 
OK.
OK.