Heronian triangle — In geometry, a Heronian triangle is a triangle whose sidelengths and area are all rational numbers. It is named after Hero of Alexandria.PropertiesAny triangle whose sidelengths are a Pythagorean triple is Heronian, as the sidelengths of such a… … Wikipedia
List of geometry topics — This is list of geometry topics, by Wikipedia page.*Geometric shape covers standard terms for plane shapes *List of mathematical shapes covers all dimensions *List of differential geometry topics *List of geometers *See also list of curves, list… … Wikipedia
117 (number) — 117 (one hundred [and] seventeen) is the natural number following 116 and preceding 118. ← 116 118 → 117 ← … Wikipedia
List of mathematics articles (H) — NOTOC H H cobordism H derivative H index H infinity methods in control theory H relation H space H theorem H tree Haag s theorem Haagerup property Haaland equation Haar measure Haar wavelet Haboush s theorem Hackenbush Hadamard code Hadamard… … Wikipedia
List of polygons, polyhedra and polytopes — This is a list of polygons, polyhedra and polytopes, by Wikipedia page. See also list of regular polytopes, list of geometry topics.*10 sided dice *24 cell *600 cell *120 cell *Antiprism *Archimedean solid *Bipyramid *Catalan solid *Chiliagon… … Wikipedia
Equilateral triangle — In geometry, an equilateral triangle is a triangle in which all three sides have equal lengths. In traditional or Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also equal to each other and… … Wikipedia
Heron's formula — In geometry, Heron s (or Hero s) formula states that the area (A) of a triangle whose sides have lengths a , b , and c is :A = sqrt{sleft(s a ight)left(s b ight)left(s c ight)}where s is the semiperimeter of the triangle::s=frac{a+b+c}{2}.Heron s … Wikipedia
