tan(30 deg) = 0.5774, approx.
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45 degrees
the tangent of an angle is equal to the length of the opposite side from the angle divided by the length of the side adjacent to the angle.
If you know the angle's sine, cosine, or tangent, enter it into the calculator and press <inverse> sine, cosine, or tangent. On MS Calc, in Scientific Mode, using Degrees, enter 0.5, then check Inv and the press sin. You should get 30 degrees. The other functions work similarly.
There can be no tangent side. The tangent of an angle, in a right angled triangle, is a ratio of the lengths of two sides.
1/(tangent of angle)