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Geometries are defined by their objects of study. Euclidean geometry is naturally preoccupied with distance and angle. Otherwise how could we distinguish between an acute and an obtuse triangle? In the discipline of topology a straight line is as good as a curved one. Projective geometry falls between these two extremes. We have already met projections; projective geometry studies properties unchanged by these.
KeywordsProjective Plane Projective Geometry Traffic Light Euclidean Plane Projective Transformation
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