'Measure of the exterior angles.
Returns
exterior_angle : number
See Also
sympy.geometry.line.LinearEntity.angle_between
Examples
>>> from sympy.geometry import RegularPolygon, Point
>>> rp = RegularPolygon(Point(0, 0), 4, 8)
>>> rp.exterior_angle
pi/4'

@property
def exterior_angle(self):

    return ((2 * S.Pi) / self._n)
