Answer
The required solution is $\frac{2\pi }{2}=\pi $
Work Step by Step
We know that the amount of rotation of the terminal side from the initial side determines the size of an angle. Angles can be expressed in degrees as well as in radians. In degrees, the value of an angle is symbolized by a small raised circle ${}^\circ $. The measure of one revolution of the terminal side is $360{}^\circ $ in degrees and $2\pi $ in radians.
For an example, if the terminal side rotates $\frac{1}{2}$ of a revolution, then, the angle will be
$\frac{360{}^\circ }{2}=180{}^\circ $
or
$\frac{2\pi }{2}=\pi $
