Find the angle between the plane `x-y+2z=9` and `2x+y+z=7`

Find the angle between the planes x-y+2z=9 and 2x+y+z=7.

CHOOSE the correct answer from the following alternative : the angles between the two planes x-y+2z=9 and 2x+y+z=7 is -

Angle between the planes x+y+2z=6 and 2x-y+z=9 is

The angle between the planes 2x - y +z = 6 and x + y+2z = 7 is

Find the angle between the planes 2x+y-2z+3=0a n d 6x−2y+3z=5

Find the angle between the lines 2x=3y=-z and 6x=-y=-4z

The angle between the planes x-2y+2z=5 and 2x-3y+6z=11 is -

The actue angle between the plane 2x-y+z=6 and x+y+2z=3 is __

If the angle between the plane x-3y+2z=1 and the line (x-1)/2=(y-1)/1=(z-1)/(-3) is, theta then the find the value of cos e cthetadot

Angle between the planes x + y +2z =6 and 2x -y + z = 9 is