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## Perpendicular

Denoting the latest stage of English Gothic church architecture, prevalent from the late 14th to mid 16th centuries and characterized by broad arches, elaborate fan vaulting, and large ... ## perpendicular Quick reference

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

Reference type:
Subject Reference
Current Version:
2013

... 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.)

Reference type:
Subject Reference
Current Version:
2014

... 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

Reference type:
Subject Reference
Current Version:
2013

... 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.)

Reference type:
Subject Reference
Current Version:
2014

... 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.)

Reference type:
Subject Reference
Current Version:
2014

... 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.)

Reference type:
Subject Reference
Current Version:
2014

...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.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Mathematics and Computer Science
Length:
46 words
Illustration(s):
1

... 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.)

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 axis theorem Quick reference

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

Reference type:
Subject Reference
Current Version:
2014

... 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.)

Reference type:
Subject Reference
Current Version:
2019

...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

Reference type:
Subject Reference
Current Version:
2013

...-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

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

The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB. ## perpendicular 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=0. ## perpendicular 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 ... ## 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 ... ## Perpendicular Axis Theorem

The following theorem about moments of inertia of a lamina:TheoremSuppose 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 ... ## ground cover Quick reference

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

Reference type:
Subject Reference
Current Version:
2015

...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.)

Reference type:
Subject Reference
Current Version:
2015

...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...  View: