My appologies for the basic geometry question. I can't figure it out, and it's driving me crazy.
I have a convex 4 sided polygon.
Assume I know the lengths of the two diagonals P & Q.
Assume I know the side lengths of 2 of the opposite sides, A & C.
I need to have an algorithm for identifying the size of the angles between: A and P. C and P. A and Q. C and Q.
Obviously, if I have one, the rest can be deduced through the law of sines and sum of the angles of a triangle = pi.