tan(2.68510941890) = 0.0469 approx.
tan(2.6851) gives the same result. The additional digits are in the angle are quite spurious.
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If the tangent of the angle is [0.171], then the angle is approximately [9.704 degrees] (rounded)
90 degree
60
tan(10 deg) = 0.1063, approx.
tan(6 deg) = 0.1051 approx.