Two projective triangles are in perspectivity from a line when the three intersections of corresponding sides lie on one projective line, called their axis of perspectivity. In the nondegenerate setting this is dual to perspectivity from a point under point-line duality.

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  1. Desargues's theorem
  2. Projective plane
  3. Projective space
  4. Algebraic variety
  5. Algebraic geometry
  6. Geometry and topology
  7. Area of mathematics
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