sine = opp/hyp i.e. 12/13
cosine = adj/hyp i.e. 5/13
tangent = opp/adj i.e. 12/5
cosecant = hyp/opp i.e. 13/12
secant = hyp/adj i.e. 13/5
cotangent = add/opp i.e. 5/12
