Question

what is radian in trigonometry???​

Answer 1

Answer:

The radian is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it subtends; one radian is just under 57.3 degrees.

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Answer 2

A radian is  unit of measure for angles in circles and make it possible to relate a linear measure and an angle measure, but it is not to be confused with radius.