Distance between the points (1, 3, 2) and (2, 1, 3) is [MP PET 1988]
12
√12
√6
6
d=√1+4+1=√6.
The angle between the planes 3x - 4y + 5z = 0 and 2x -y - 2z = 5 is [MP PET 1988]