In projective geometry, Desargues's theorem, named after Girard Desargues, states: Two triangles are in perspective axially if and only if they are in perspective centrally. Two triangles are in perspective axially if corresponding sides of the triangles, when extended, meet at points on a line, called the axis of perspectivity.
In projective geometry, Desargues's theorem, named after Girard Desargues, states: Two triangles are in perspective axially if and only if they are in perspective centrally. Two triangles are in perspective axially if corresponding sides of the triangles, when extended, meet at points on a line, called the axis of perspectivity.
Source: Wikipedia "Desargues's theorem" · CC BY-SA 4.0
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