In higher classes, we don’t use degree to measure angles
We use radians.
We define radian in terms of length of arc:
Angle subtended by an arc of 1 unit in a circle of radius 1 unit is 1 radian.
In other words,
If length of arc is 1 unit
& Radius = 1 unit
Then, angle at center = 1 radian
Note: In θ = l/r i.e. length of arc formula,
Angle is measured in radians

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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