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radian
The raian is a unit of plane angle, equal to 180/π degrees, or about 57.2958 degrees. It is the standard unit of angular measurement in all areas of mathematics beyond the elementary level.
Trivia about radian
(Cheryl of the Clue Crew points to a diagram on the chalkboard.) In the ratio of s to r, this measure of an angle is similar to the word that the r stands for