## You are looking at 1-20 of 101 entries  for:

• All: perpendicular lines
• Science and technology
clear all  View:

Overview

## perpendicular lines

In coordinate geometry of the plane, a useful necessary and sufficient condition that two lines, with gradients m 1 and m 2, are perpendicular is that m ... ## perpendicular lines Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

Reference type:
Subject Reference
Current Version:
2014

... lines In coordinate geometry of the plane, a useful necessary and sufficient condition that two lines, with gradients m 1 and m 2 , are perpendicular is that m 1 m 2 =−1. (This is taken to include the cases when m 1 =0 and m 2 is infinite, and vice... ## perpendicular lines

In coordinate geometry of the plane, a useful necessary and sufficient condition that two lines, with gradients m 1 and m 2, are perpendicular is that m 1 m 2=−1. (This is taken to include the cases ... ## common perpendicular

Let l 1 and l 2 be two straight lines in space that do not intersect and are not parallel. The common perpendicular of l 1 and l 2 is the straight line that meets both lines and is perpendicular to ... ## perpendicular

At right angles to one another. Can be of two lines, two planes, a line and a plane, or a line and a surface. ## lines of force

Imaginary lines in a field of force that enable the direction and strength of the field to be visualized. They are used primarily in electric and magnetic fields; in electric fields they are ... ## distance between two lines

(in 3-dimensional space)Let l 1 and l 2 be lines in space that do not intersect. There are two cases. If l 1 and l 2 are parallel, the distance between the two lines is the length of any line segment ... ## equipotential

1 (line) The two-dimensional locus of all points with equal value for a potential field.2 (surface) The three-dimensional distribution of all points of equal value for a potential field. ... ## graph paper

Paper printed with intersecting lines for drawing graphs or diagrams. The simplest form has equally spaced perpendicular lines, but one or both axis may use logarithmic scales, or scales derived from ... ## oblique

A pair of intersecting lines, to be taken, for example, as coordinate axes, are oblique if they are not (or at least not necessarily) perpendicular. Three concurrent lines, similarly, are oblique if ... ## tangent plane

Let P be a point on a smooth surface. The tangent at P to any curve through P on the surface is called a tangent line at P, and the tangent lines are all perpendicular to a line through P called the ... ## hexahedrite

A class of iron meteorite, containing not more than 4–6% nickel. Hexahedrites consist of large cubic crystals of kamacite (an iron–nickel alloy) over 50 mm across, and they can be cleaved in three ... ## cylinder

In elementary work, a cylinder, if taken, say, with its axis vertical, would be reckoned to consist of a circular base, a circular top of the same size, and the curved surface formed by the vertical ... ## right-handed system

Let Ox, Oy and Oz be three mutually perpendicular directed lines, intersecting at the point O. In the order Ox, Oy, Oz, they form a right-handed system if a person standing with their head in the ... ## pi diagram

A stereographic projection, used in the analysis of the orientation of folds, in which poles (points representing lines) perpendicular to folded bedding (π poles) are plotted, and the diagram rotated ... ## symbiotic star

A star (in many cases a cataclysmic variable) that exhibits spectral lines at highly contrasting temperatures, such as those typical of a late-type red giant or supergiant (3000 K), and a dwarf B ... ## cone

In elementary work, a cone usually consists of a circle as base, a vertex lying directly above the centre of the circle, and the curved surface formed by the line segments joining the vertex to the ... ## orthogonal

1 (of axes, lines, planes, surfaces, etc.) mutually at right angles; perpendicular to one another.2 (in statistics) (of a set of variates) being, or regarded as being, statistically independent.[...] ## Lamb-dip spectroscopy

A spectroscopic technique enabling the centres of absorption lines to be determined very precisely by making use of the Doppler shift associated with very rapidly moving molecules. An intense ... ## Zeeman effect

The splitting of the lines in a spectrum when the source of the spectrum is exposed to a magnetic field. It was discovered in 1896 by Pieter Zeeman (1865–1943). In the normal Zeeman effect a single ... ## dihedral

An angle formed by the intersection of two planes (e.g. two faces of a polyhedron). The dihedral angle is the angle formed by taking a point on the line of intersection and drawing two lines from ...  View: