Say, I have a quadrilateral where all four internal angles are defined, say ∠a, ∠b, ∠c, ∠d . This should be enough to determine the shape of the quadrilateral even though its size can be arbitrary.
So if shape of this quadrilateral is defined, we should be able to determine the angle of intersection of its diagonals. Is there any formula for determining the angle of intersection of diagonals for the quadrilateral?
Not possible, because the four internal angles don't determine the shape of a quadrilateral. Consider a square vs. a rectangle.