## perpendicular Quick reference

### A Dictionary of Construction, Surveying and Civil Engineering

... 1. At right angles to another object, for example, a perpendicular joint is at 90° to the horizontal mortar bed in a wall. 2. Something that stands vertical to the ground, is at 90° to the...

## perpendicular Quick reference

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

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

## perpendicular style Quick reference

### A Dictionary of Construction, Surveying and Civil Engineering

... style Gothic architecture that is exaggerated by vertical straight and slender aspects such as windows and...

## perpendicular bisector Quick reference

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

... bisector The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB...

## perpendicular planes Quick reference

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

... planes Two planes in 3‐dimensional space are perpendicular if normals to the two planes are perpendicular. If n 1 and n 2 are vectors normal to the planes, this is so if n 1 . n 2...

## common perpendicular Quick reference

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

...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 distance Quick reference

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

... distance The distance from a point to a line or plane measured along the line perpendicular to the line or plane which passes through the given point. It will be the shortest distance between the point and any given point on the line or...

## perpendicular lines Quick reference

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

... 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 axis theorem Quick reference

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

... axis theorem The following theorem about moments of inertia of a lamina : Theorem Suppose that a rigid body is in the form of a lamina lying in the plane z =0. Let I 0x , I 0y and I 0z be the moments of inertia of the body about the three coordinate axes. Then I 0z = I 0x + I 0y...

## perpendicular-axes theorem Quick reference

### A Dictionary of Mechanical Engineering (2 ed.)

...perpendicular-axes theorem 1. If I x and I y are the mass moments of inertia of a rigid plane lamina about any pair of orthogonal axes in its plane, then the mass moment of inertia I z about the z -axis (the polar moment of inertia ) is given by I z = I x + I y . 2. If I x and I y are the second moments of area of a rigid plane lamina about any pair of orthogonal axes in its plane, then the second moment of area J about the z -axis (the polar second moment of area ) is given by J = I x + I y . See also parallel-axes theorem...

## perpendicular-axes theorem Quick reference

### A Dictionary of Mechanical Engineering

...-axes theorem 1. If I x and I y are the mass moments of inertia of a rigid plane lamina about any pair of orthogonal axes in its plane, then the mass moment of inertia I z about the z -axis (the polar moment of inertia ) is given by I z = I x + I y . 2. If I x and I y are the second moments of area of a rigid plane lamina about any pair of orthogonal axes in its plane, then the second moment of area J about the z -axis (the polar second moment of area ) is given by J = I x + I y . See also parallel-axes theorem...

## perpendicular

## common perpendicular

## perpendicular bisector

## perpendicular planes

## perpendicular distance

## perpendicular lines

## Perpendicular Axis Theorem

## ground cover Quick reference

### A Dictionary of Ecology (5 ed.)

...cover The area of ground that is covered by a plant when its canopy edge is projected downwards perpendicularly...

##
horizontal cell
*n.*
Quick reference

### A Dictionary of Psychology (4 ed.)

...cell n . A type of cell in the retina that lacks an axon , lying perpendicular to the sensory pathway and linking photoreceptors and bipolar cells , one of its important functions being to inhibit neurons outside the immediate zone of excitation. Compare amacrine cell...