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the perpendicular height of a triangle

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  • Triangle — This article is about the basic geometric shape. For other uses, see Triangle (disambiguation). Isosceles and Acute Triangle redirect here. For the trapezoid, see Isosceles trapezoid. For The Welcome to Paradox episode, see List of Welcome to… …   Wikipedia

  • Logic and the philosophy of mathematics in the nineteenth century — John Stillwell INTRODUCTION In its history of over two thousand years, mathematics has seldom been disturbed by philosophical disputes. Ever since Plato, who is said to have put the slogan ‘Let no one who is not a geometer enter here’ over the… …   History of philosophy

  • 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

  • Kepler triangle — A Kepler triangle is a right triangle with edge lengths in geometric progression. The ratio of the edges of a Kepler triangle are linked to the golden ratio:varphi = {1 + sqrt{5} over 2}and can be written: 1 : sqrtvarphi : varphi, or… …   Wikipedia

  • altitude — noun /ˈælt.ɪˌtjuːd,ˈæltəˌtud/ a) The height measured from sea level up to any given point. The perpendicular height of a triangle is known as its altitude. b) A vertical distance …   Wiktionary

  • Area — This article is about the geometric quantity. For other uses, see Area (disambiguation). The combined area of these three shapes is between 15 and 16 squares. Area is a quantity that expresses the extent of a two dimensional surface or shape in… …   Wikipedia

  • Second moment of area — The second moment of area, also known as the area moment of inertia or second moment of inertia, is a property of a shape that is used to predict its resistance to bending and deflection which are directly proportional. This is why beams with… …   Wikipedia

  • Base (geometry) — The base of any geometric figure is (for polygons) any side that you wish to measure from or, (for polyhedra), any face that you wish to measure from. Bases are most commonly used in geometric formulas for area and volume. It is most commonly… …   Wikipedia

  • Apothem — The apothem of a regular polygon is a line segment from the center to the midpoint of one of its sides. Equivalently, it is the line drawn from the center of the polygon that is perpendicular to one of its sides. The word apothem can also refer… …   Wikipedia

  • Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …   Wikipedia

  • History of trigonometry — The history of trigonometry and of trigonometric functions may span about 4000 years.EtymologyOur modern word sine is derived from the Latin word sinus , which means bay or fold , from a mistranslation (via Arabic) of the Sanskrit word jiva ,… …   Wikipedia

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