Triangle geometry

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2 3 7 triangle group 30 60 90 triangle Acute and obtuse triangles Acute triangle Altitude triangle Angle bisector theorem Apollonius point Automedian triangle Barrows inequality Barycentric coordinates Bernoulli's quadrisection problem Bezier triangle Brocard circle Brocard points Brocard triangle Carnot's theorem conics Carnot's theorem inradius circumradius Carnot's theorem perpendiculars Carotid triangle Catheti Ceva's theorem Cevian Circular triangle Circumcircle Clavipectoral triangle Clawson point Cleaver Codman triangle Congruent isoscelizers point Contact triangle Conway triangle notation Cpctc De finetti diagram De longchamps point Equal incircles theorem Equal parallelians point Equilateral triangle Euler's line Eulers theorem in geometry Exeter point Exterior angle theorem Eye of providence Fagnanos problem Fermat point Fuhrmann triangle Geometric mean theorem Gergonne point Golden triangle Heilbronn triangle problem Historic triangle Hofstadter points Hyperbolic triangle Ideal triangle Incircle and excircles of a triangle Inellipse Inguinal triangle Inverse pythagorean theorem Isodynamic point Isogonal conjugate Isoperimetric point Isosceles right triangle Isosceles triangle Isosceles triangle theorem Isotomic conjugate Isotomic lines Jacobi point Johnson circles Kepler triangle Kobon triangle problem Kosnita's theorem Lemoines problem Lesters theorem Lithium triangle Love triangle Lozanic's triangle Mandart inellipse Maxwell theorem Medial triangle Median Menelaus theorem Miquels theorem Mittenpunkt Modern triangle geometry Mollweides formula Monsky's theorem Morley centers Morley's trisector theorem Morley triangle Musselman's theorem Nagel point Napoleon points Napoleons theorem Nine point circle Nonobtuse mesh Oblique triangle Obtuse triangle One seventh area triangle Orthocenter Orthocentric system Orthopole Pappus's centroid theorem Parliamentary triangle canberra Parry point triangle Pedal triangle Point normal triangle Polynomial sequence Pompeiu's theorem Pons asinorum Rational triangle Research triangle Reuschles theorem Rhubarb triangle Right triangle Rombergs method Rouths theorem Scalene triangle Schiffler's theorem Shield of the trinity Similarity system of triangles Simson line Skinny triangle Solution of triangles Spherical triangle Spieker center Spieker circle Splitter Steiner circumellipse Steinerlehmus theorem Stewarts theorem Submandibular triangle Submental triangle Sum of angles of a triangle Sunni triangle Symmedian Tangential triangle Tarry point Ternary plot The secrets of triangles Thomson cubic Triangle center Triangle mesh Triangle musical instrument Triangle postulate Triangular pyramid Triangular trade Triangulation Trilinear polarity Triquetra Valknut Viviani's theorem

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