What is the radian measure of the unfolded angle?

The flattened angle is 180 °.
The radian measure of an angle is the ratio of the length of the corresponding arc to the radius of the circle.
The radian measure of the angle is obtained from the degree multiplied by π / 180 °.
The unit of the radian measure of angles is radians.
The radian measure of the 180 ° angle (flat angle) is π.



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