12. The diagram below is a parallelepiped where B(2,3,6), E(5,-1,-2), F(1,-3,2) and G(0,7,0). a) Find the volume of the parallelepiped. b) Find the coordinates of point H. c) Find the acute angle of intersection between the diagonals FH and EG. E A B H [K/U: [T/I: [K/U: D /3] /2] /2]

Fig: 1