Find an equation of the given plane. The plane containing the points 
, 
and 
Definitions:
Pitch Diameter
The effective diameter of a screw thread, roughly midway between the major and minor diameters.
Diametral Pitch
A measure of tooth density in gear sets, representing the number of teeth per unit of pitch diameter.
Circular Pitch
In gear design, the distance measured along the pitch circle between corresponding points on adjacent teeth.
Root Diameter
The diameter of a gear or screw measured at the base of the teeth or threads, where the material is the thickest.
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