Philip P. answered 06/05/14
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There are 360o in a circle and 2(pi) radians in a circle, so 360o=2(pi) radians. Use the following proportion to convert.
210o x radians
------ = ------------------
360o 2(pi) radians
Solve for x, which is the value of 210o converted to radians. Use you calculator (and the pi button on it) to get the numerical answer.