# solid angle

### noun Geometry.

an angle formed by three or more planes intersecting in a common point or formed at the vertex of a cone.

## Words nearby solid angle

## Origin of solid angle

First recorded in 1695–1705

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## British Dictionary definitions for solid angle

solid angle

### noun

a geometric surface consisting of lines originating from a common point (the vertex) and passing through a closed curve or polygon: measured in steradians

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## Scientific definitions for solid angle

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.

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