Radian Sign Video
Upload On Sat Feb 12 2011 by ASL STEM
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Definition
A unit for measuring angles. The number of radians in an angle equals the number of radii it takes to measure a circular arc described by that angle. It uses a symbol of theta for mathematics.
Source: mathwords.com
Example
180 degrees angle is equal to pi radians. An 360 degrees angle is equal to two pi radians. A complete circular arc has length equal to two pi times the radius.
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