The don't give you a clue? That's a tough row to hoe.
Given three points in 3space, a plane isn't too bad. Subtract two pairs of points to produce two vectors in the plane, then find the cross product to to product the vector normal to the plane.
(Coordinates of 2) less (Coordinates of 1) = Plane Vector 1
(Coordinates of 3) less (Coordinates of 1) = Plane Vector 2
(Plan Vector 1)x(Plan Vector 2) = Normal Vector 1
Do that with the other set of three points and you now have two normal vectors.
These can be used to calculate the angle between the planes.
Unfortunate Note: It is common practice for other fields of study to use their own language and not the mathematical language. You may be more acquainted with the idea than the terminology. Don't be discouraged if you haven't a clue what I am talking about. It's just a language barrier. Once we overcome that, you'll see it.