polar angle

noun Mathematics.
See under polar coordinates.
Dictionary.com Unabridged

polar coordinates

noun Mathematics.
a system of coordinates for locating a point in a plane by the length of its radius vector and the angle this vector makes with the polar axis (polar angle)

Origin:
1810–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
polar coordinates
 
pl n
Cartesian coordinates See also spherical coordinates a pair of coordinates for locating a point in a plane by means of the length of a radius vector, r, which pivots about the origin to establish the angle, θ, that the position of the point makes with a fixed line. Usually written (r, θ)

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Example sentences
The other one is circles and radial lines which are drawn by the set grid polar angle command.
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