We know that an arc is a part of the entire perimeter of a circle.
Radian is defined as a unit of plane angular measurement that is equal to the angle subtended by the circle at the center by an arc that is of the length equal to the radius
We also know that the circle as a whole contains 2π radians
we know that s=rΘ
S=rθ represents the central angle in radians and r is the length of the radius.
Thus we can say that radian measure of an angle theta is the length of the arc.
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