diminution
noun
a reduction in the size, extent, or importance of something.
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parallel
adjective
(of lines, planes, surfaces, or objects) side by side and having the same distance continuously between them.
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picture plane
noun
in perspective, the imaginary plane corresponding to the surface of a picture, perpendicular to the viewer’s line of sight.
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right angle
noun
an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.
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oblique angle
noun
An angle, such as an acute or obtuse angle, that is not a right angle or a multiple of a right angle.
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intersection
noun
a point or line common to lines or surfaces that intersect.
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tangent
noun
a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
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convergence
noun
the process or state of converging.
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foreshorten
verb
gerund or present participle: foreshortening
portray or show (an object or view) as closer than it is or as having less depth or distance, as an effect of perspective or the angle of vision.