- trianglefive squarestriangle midpoint theoremthe triangle inequalitythe lunes of Alhazenthe lune of Hippocratesthe angle bisector theoremsclassifying triangles...triangles...triangle angle-sum theoremsquare roots in a greek way...pythagorean theorem (a puzzle)area of a trianglea trianglearchimedes' arbelosareas of similar trianglespythagorean theorem (proof)equilateral triangle (SAS)measuring van gogh's cypressthe outer Napoleon trianglereflections of a trianglesierpinski trianglestriangle-1right triangle trigonometry-1simson linenine-point circleangle bisector as locusincircle and excircles of a trianglean archimedes' formulaaxis of symmetryfind the tan(φ)equal chordsan isosceles triangle...cuboidan equilateral trianglesum of the interior angles of a n-gona Reuleaux trianglecongruent trianglesminimum area (line)maximum area (angle)area of an equilateral trianglegeneralization (pappus) of pythagoreanratio of areas-1ratio of areas-2an apollonian circlelaw of sines (proof)law of cosines (proof)Johnson's theoremKoch snowflakeconstruction of a triangle (sss)miquel's triangle theoremproof of pythagorean-5angle trisectionfirst brocard pointnagel pointgergonne pointmorley's triangledistance between point-linevivianni's theoremchords and tangentsthe famous "1/7" triangletriangles...congruent trianglesright triangle trigonometryright triangle trigonometry-2chord theoremarea of a triangle (sas)area of a triangle-2a square in a squarelemoine pointexeter pointvecten pointsfeuerbach's pointisosceles triangle paradoxproperties of the altitudesfind the area-1triangular numbersSolving Similar Triangles (1)Water Triangleconway circlethe height of the pyramid
