Systerms : system terms : Radian

A (41) | B (23) | C (62) | D (45) | E (33) | F (34) | G (18) | H (16) | I (28) | J (2) | K (5) | L (14) | M (29) | N (17) | O (10) | P (62) | Q (10) | R (41) | S (74) | T (31) | U (12) | V (12) | W (8) | X (1) | Y (2) | Z (2)

A radian is a unit for measuring angles. Simply put, it measures the size of an angle using the ratio of the arc length to the radius, and its symbol is rad. When the arc length of a circle exactly equals its radius, the central angle corresponding to that arc is 1 radian, which is roughly 57.3 degrees.

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