Orthocentric system

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1	Forum Geometricorum Volume[removed]–52. FORUM GEOM Add to Reading List Source URL: forumgeom.fau.edu Language: English - Date: 2012-03-05 09:58:58 Quadrilaterals Triangles Orthocentric system Nine-point circle Incircle and excircles of a triangle Triangle Circumscribed circle Complete quadrangle Simson line Geometry Triangle geometry Circles
2	PDF Document Add to Reading List Source URL: www.usamts.org Language: English - Date: 2010-09-20 13:54:57 Altitude Triangle Right triangle Golden ratio Circle Perpendicular Quadrilateral Orthocentric system Pedal triangle Geometry Triangle geometry Triangles
3	PDF Document Add to Reading List Source URL: www.geometrie.tuwien.ac.at Language: English - Date: 2003-04-08 15:34:04 Triangles Polyhedra Deltahedra Platonic solids Tetrahedron Orthocentric tetrahedron Altitude Orthocentric system Triangle Geometry Euclidean geometry Triangle geometry