Answer:
-A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections of mutually parallel lines in three-dimensional space appear to converge.
-orthogonality is the generalization of the notion of perpendicularity to the linear algebra of bilinear forms.
-in perspective, the imaginary plane corresponding to the surface of a picture, perpendicular to the viewer's line of sight.
Explanation:
