EntityQ841893· pop 28· linked from 53 articlesDesargues' theoremSign in to savetheorem that two triangles are in perspective axially if and only if they are in perspective centrallyConnectionsprojective planeEntitytriangleEntityInternational Standard Book NumberEntityDavid HilbertEntitydigital object identifierEntitysymmetryEntityInternational Standard Serial NumberEntitytheoremEntityplaneEntityhexagonEntitycommutative propertyEntityfieldEntityJSTOROrganizationOxford University PressEntitysimilarityEntityvertexEntityJean-Victor PonceletEntityCambridge University PressEntityedgeEntityif and only ifEntityCategoriesEuclidean plane geometryProof without wordsTheorems about trianglesTheorems in projective geometry