The planes `px+2y+2z-3=0 and 2x-y+z+2=0` intersect at an angle `pi/4`. What is the value of `p^2`?

Are the planes x+y-2z+4=0 and 3x+3y-6z+5=0 intersecting

If the planes x + 2y + kz = 0 and 2x+y - 2z = 0 are at rt. angles, then the value of k is:

If the planes x+2y+kz=0 and 2x+y-2z=0 , are at right angles, then the value of k is

If the planes x+2y+kz=0 and 2x+y-2z=0 , are at right angles, then the value of k is

If the planes 2x+y-2z=0and x+2y+kz=0 are at right angles, then the value of k is

Let the acute angle bisector of the two planes x - 2y - 2z + 1 = 0 and 2x - 3y - 6 z+ 1= 0 be the plane P. Then which of the following points lies on P ?

The angle between the planes 3x-4y+5z=0 and 2x-y-2z=5 is