0.813
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tan (30 degrees) would be equal to 0.577350269.
1.37638 (rounded)
tan(1) = 1.5574 where the angle is measured in radians.
If B is 90 degrees, Tan A is BC / AB. But I don't know what you mean by Tan A by 2.
That is not correct. "tan x" is a function that depends on the value of "x"; it is not always pi. tan(x) is pi only if 'x' is about 72.3 degrees, 252.3 degrees, or either of these added to a multiple of 360 degrees.