drop a perpendicular

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• drop — I. noun Usage: often attributive Etymology: Middle English, from Old English dropa; akin to Old High German tropfo drop Date: before 12th century 1. a. (1) the quantity of fluid that falls in one spherical mass (2) plural a dose of medicine… …   New Collegiate Dictionary

• Drop structure — A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam s spillway, to pass water to a lower elevation while controlling the energy and velocity of… …   Wikipedia

• drop of a sail — Depth Depth (s[e^]pth), n. [From {Deep}; akin to D. diepte, Icel. d[=y]pt, d[=y]p[eth], Goth. diupi[thorn]a.] 1. The quality of being deep; deepness; perpendicular measurement downward from the surface, or horizontal measurement backward from the …   The Collaborative International Dictionary of English

• drop-off — noun Date: 1923 1. a very steep or perpendicular descent 2. a marked dwindling or decline < a drop off in attendance > 3. the act or an instance of making a usually brief deposit or delivery < drop off …   New Collegiate Dictionary

• Law of cosines — This article is about the law of cosines in Euclidean geometry. For the cosine law of optics, see Lambert s cosine law. Figure 1 – A triangle. The angles α, β, and γ are respectively opposite the sides a, b, and c …   Wikipedia

• Duality (projective geometry) — A striking feature of projective planes is the symmetry of the roles played by points and lines in the definitions and theorems, and (plane) duality is the formalization of this metamathematical concept. There are two approaches to the subject of …   Wikipedia

• Angle of parallelism — In hyperbolic geometry, the angle of parallelism Φ is the angle at one vertex of a right hyperbolic triangle that has two asymptotic parallel sides. The angle depends on the segment length a between the right angle and the vertex of the angle of… …   Wikipedia

• Brahmagupta theorem — Brahmagupta s theorem is a result in geometry. It states that if a cyclic quadrilateral has perpendicular diagonals, then the perpendicular to a side from the point of intersection of the diagonals always bisects the opposite side. It is named… …   Wikipedia

• Pythagorean theorem — See also: Pythagorean trigonometric identity The Pythagorean theorem: The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c) …   Wikipedia

• Absolute geometry — is a geometry based on an axiom system for Euclidean geometry that does not assume the parallel postulate or any of its alternatives. The term was introduced by János Bolyai in 1832.[1] It is sometimes referred to as neutral geometry,[2] as it is …   Wikipedia

• fluid mechanics — an applied science dealing with the basic principles of gaseous and liquid matter. Cf. fluid dynamics. [1940 45] * * * Study of the effects of forces and energy on liquids and gases. One branch of the field, hydrostatics, deals with fluids at… …   Universalium