# solid angle

noun, Geometry
1.
an angle formed by three or more planes intersecting in a common point or formed at the vertex of a cone.
Origin of solid angle
1695-1705
1695-1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for solid angle
Historical Examples
• Three regular polygons of six or more sides cannot form a solid angle.

• Hence three will form a solid angle, that of the cube, and four will not.

• If a solid angle be contained by three plane angles, any two of them are together greater than the third.

• There is no telling what the web and rivets would have borne had not the solid angle irons given way at the first bend.

• This appeareth plainely out of the nature of a solid angle, by the kindes of plaine figures.

Peter Ramus
• Hence it is possible to form a solid angle with three, four or five regular triangles or faces.

• A similar difference exists between a solid angle and an n-edge or an n-flat.

British Dictionary definitions for solid angle

## solid angle

noun
1.
a geometric surface consisting of lines originating from a common point (the vertex) and passing through a closed curve or polygon: measured in steradians
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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solid angle in Science
 solid angle   A three-dimensional angle, formed by three or more planes intersecting at a common point. Its magnitude is measured in steradians, a unitless measure. The corner of a room forms a solid angle, as does the apex of a cone; one can imagine an indefinite number of planes forming the smooth round surface of the cone all intersecting at the apex. Solid angles are commonly used in photometry.
The American Heritage® Science Dictionary
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### Difficulty index for solid angle

Few English speakers likely know this word

### Word Value for solid

6
7
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