Angle a, by itself has no value. You must first assign a value to a to get the value of tan a.
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The tangent secant angle is the angle between the tangent to a circle and the secant, when the latter is extended.
196-164/2= 16
The angle between the radius and the tangent is a right angle of 90 degrees.
If the tangent of the angle is [0.171], then the angle is approximately [9.704 degrees] (rounded)
Because the tangent is a function of with the angle as its argument.