I am assuming that you are in a three dimensional world. Then the three planes of projection would be the xy plane, the xz plane, and the yz plane.
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In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
it is physically the projection or shadow of a line on a plane...
the answer is... -OBLIQUE -ISOMETRIC -PERSPECTIVE OR -DIAMETRIC
three points can determine a plane
A plane is two dimensional.