[FWB]

here this will be easier to understand

sin (Deg)= opposite side/ hypotenuse
cos(deg)= adjacent side/ hypotenuse
tan(deg)= opposite/adjacent sides


deg=degrees
opposite side= the length of the side opposite the angle your finding
adjacent side= " " " " " adjacent to the angle your finding
hypotenuse= the length of the side opposite the right angle

so plug in the sides to the formula get the answer to the division and then hit the sin^-1 key or the cos^-1 key etc..... to get the angle

or post the lengths and i'll tell you what angle you have