A Radian is the measure between the length of an arc and its radius. this isa usually represented by the symbol "rad" or a subscript "c". Radian describes the plane angle by a circular arc as the length of the arc is divided by the radius of that arc. more simply put, a measurment for angles using the radius within a circle, instead of the cos, sin, and tan ratios. they are both right, but can be used for different things.
Conversion
1.degrees, is equal to rad * 180 degrees/ Pi.
2. one rad = 1* 180 degrees/ Pi. ~ 57.2958
there are other conversions, but i won't list them all. there are also charts to help with these conversions, you should find a good one by searching "Radian to Degrees conversion chart".
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