It's not. The tangent of 180 degrees is zero.
Consider tan(x) = sin(x)/cos(x). When x = 180 degrees, sin(x) = 0 and cos(x) = -1 and so tan(x) = 0
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180 degrees, or pi.
pi radians (180 degrees).
Zero and any other multiple of 180 degrees.
The tangent function is a periodic function with period 180 degrees sotan(360) = tan(360-2*180) = tan(0) = 0.
All positive and negative multiples of 180 degrees. (pi radians)