Here are coordinates for 8 points in the coordinate plane (q>p>0). A(0,0), B(p,0), C(q,0), D(p+q,0), E(0,q), F(p,q), G(q,q) H(p+q,q). Which...

Here are coordinates for 8 points in the coordinate plane (q>p>0). A(0,0), B(p,0), C(q,0), D(p+q,0), E(0,q), F(p,q), G(q,q) H(p+q,q). Which four points, if any, are the vertices for a parallelogram?