What is the difference between degree measure and radian measure?

Radians are measured in terms of pi. Pi = 3.14 (or 180 degrees), so 1 degree = Pi/180 or 0.017 radians. To convert from radians to degrees divide by pi and multiply by 180. For example, 4.71 radians (3Pi/2 in terms of Pi) would be 270 degrees.

Reference: Unit Circle

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