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you need a calculator to do Sin-1 Opposite/hypotenuse OR Cos-1 Adjacent/Hypotenuse OR Tan-1 Opposite/Adjacent
Given the hypotenuse and the base ...-- divide the (base) by the (hypotenuse); get a number less than '1'.-- the number is the 'cosine' of the elevation angle.-- either take the cos-1 of the number on a calculator, which is the angleOR-- look up the number in a table of cosines and see what angle it represents.
No, the hypotenuse of a triangle does not represent a third dimension. A triangle is a 2 dimensional figure consisting of only dimensions in terms of x and y. In order to be a 3d figure it would need dimensions defined in terms of x, y, and z.
The answer depends on the values of the variables. Since these are not given there is no point in using a calculator.
A fraction can be turned into a decimal figure. Divide the bottom into the top to get your decimal figure. Then work in decimals.