RAD
Converts an angle from degrees[1] to a number of radians[2].
Syntax:
RAD(angle)
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Weisstein, Eric W.
"Degree."
From MathWorld--A Wolfram Web Resource.
http://mathworld.wolfram.com/Degree.html
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Weisstein, Eric W.
"Radian."
From MathWorld--A Wolfram Web Resource.
http://mathworld.wolfram.com/Radian.html