/sci/ - Science & Math

If there is a line with an angle [math]\theta[/math] respective to the X axis, and this line is tangent to a circle, if I connect circle origin to where this line intersects the circle, will this connecting line always split the angle on the other side of the line i.e. [math]\phi = 180^\circ - \theta[/math] in half? If not how it will split [math]\phi[/math]?