Revision #944 → #1640 · back to history
addedTriangle236e9af2bcfd
addedSum of angles equals straight angle10e647e6b05e
addedArea equals half base times height24a1c70f3a59
addedThree non-collinear points determine a triangled4ef29f02a80
addedGeodesic triangle1a0ddcdebdad
addedCurvilinear trianglec35f5118be51
addedTriangle (sides and vertices)fb494d910ada
addedEquilateral, isosceles, scalene trianglesf5557d89390b
addedRight, acute, obtuse trianglesd26ad9729740
addedCeva's theorem02eb51094fd4
addedMenelaus' theorema4f870cf4f5c
addedPerpendicular bisector2502b3e23891
addedCircumcenter from perpendicular bisectorse2a6c6caa38a
addedThales' theorem (circumcenter on side)7e33379261b4
addedCircumcenter location and triangle type16f2854c044f
addedAltitude of a trianglefe7a848f807c
addedOrthocenter from altitudes2f55d550049d
addedOrthocenter inside iff acute37a6e3bd928b
addedAngle bisectorfd0546b7265c
addedIncenter from angle bisectors2ee9902a4aca
addedExcircles and orthocentric system65621c6252a3
addedNine-point circle18ff01a2a164
addedEuler's line482d05f21781
addedMedian of a triangle8a6747ab4880
addedCentroid from medians86d874ea8c89
addedCentroid cuts median 2:1837031c29f57
addedSymmedian and symmedian pointaafac5de5bea
addedSum of interior angles is 180°b9e51ac5d7cc
addedExterior angle theorem4527572f8c73
addedSum of exterior angles is 360°58126f9123a9
addedTrigonometric functions in right triangles1c93b21a86ee
addedLaw of sines and cosines062e6192c4e9
addedThree angles summing to 180° form a triangle1839d4db151d
addedDegenerate triangleb0aa8f47ce41
addedSimilar triangles0b7ecd573adf
addedAA similarity9e380e19f216
addedSAS similarityb1a4632a48d6
addedSSS similarity407034261b14
addedCongruent trianglesfd6b7c4bd7e9
addedSAS congruence postulateca715ce0dd1f
addedASA congruence719e124a4df9
addedSSS congruencea9ec7c2c49cd
addedAAS congruence48d4f73eceb3
addedArea as half base times altitude8277edfdb10b
addedArea from two sides and included angled79217ad3f65
addedHeron's formulaeb36da31cea6
addedAffine relative area39eb65af66c2
addedShoelace formula for triangle areac5c78681fdd9
addedTriangle inequalityfe9566631302
addedConverse of triangle inequality830921f2ca5e
addedTriangle rigidity13ba6912fd15
addedPolygon triangulation count70b99121289b
addedTwo ears theoremdc26c7f575de
addedTrilinear coordinates6e35c8b5ab0a
addedBarycentric coordinates719774c14add
addedUnique incircle59d26382e9da
addedSteiner inellipse17cca5701672
addedMarden's theorem1d45afd76896
addedMandart inellipse32722cd79009
addedPedal triangle and medial triangle87735ec9b6fd
addedMedial triangle subdivides into four congruent triangles4d3209c3f568
addedIntouch triangle529ddfd67822
addedExtouch trianglef6d144e8df53
addedCalabi trianglece3b4775086f
addedInscribed squares by triangle type2de49ed23ff0
addedLemoine hexagon98fb603dd729
addedConvex polygon inscribed in triangle area boundeef08703c1ed
addedTangential triangleba5b68cfe28c
addedSteiner circumellipsedf845ac94542
addedKiepert hyperbolab8eabc430a54
addedMaximum-area triangle in convex polygon2e114d6ecb96
addedCircular trianglec1c6185ce9f7
addedReuleaux triangle36f37cb2d991
addedMohr–Mascheroni theorem52dba7200f1a
addedPseudotriangleb967537f3bd4
addedPseudo-triangulation countsca725b91c49b
addedConvex hull of pseudotriangle is a trianglec0edc2d91bc2
addedHyperbolic and spherical triangles6f7e16194078
addedAngle sum in hyperbolic and spherical triangles264543e78a1d
addedGirard's theorem2d0ae3059e95
addedCAT(k) space01a6e4f578b6
addedFractal triangles (Sierpiński, Koch)f9984e748a7f