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Dictionary

ra•di•an

Pronunciation: (rā'dē-un), [key]
—n. Math.
the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbr.: rad

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

radial triangulation

radiance

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