Three vertices of a parallelogram are given as P1(7, 3, 1), P2(2, 1,0), and P3(2, 2, 5).
(a) Find the area of a parallelogram with these vertices.
(b) Is the answer in (a) unique: that is, is there only one parallelogram that can be defined by these points? If not, what are the other possible solutions?