A radian is a type of measurement used to measure the arc length of a circle and many other shapes. It is basically a way to write the degrees in a more algebraically sound way. That way, we can calculate a lot more with the radian measurements. The unit circle gives the basis for all radians. It is the "Perfect" circle. 2pir relates to radians because the circumference is made up of 2pi radians. Using this and the radius length, we can find the circumference. Radians are like degrees but measure the An angle's measurement in radians is numerically equal to the length of a corresponding arc of a unit circle, so one radian is just under 57.3 degrees
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