If you know the minor scale, the root of the relative major is always the third note of the minor scale. For example, “F” is the third note of the D minor scale (D, E, F, G, A, Bb, C). F major is the relative major of D minor. It works the same for all minor scales.
In Analytical Cubism, the subject is broken down into flattened planes and sharp angles. It has a similar emphasis on geometry. Synthetic Cubism differ from Analytical Cubism in the sense that it involves adding texture and patterns to the paintings, it introduces mixed media like collage (using bits of old newspaper).