Show that the following planes are at right angle: `x-2y+4z=10\ a n d\ 18 x+17 y+4z=49.`

Show that each of the following pairs of planes are at right angles: i) 3x+4y-5z=7 and 2x+6y+6z+7=0 ii) x-2y+4z=10 and 18x+17y+4z=49

Show that the normal to the following planes are perpendicular to each other. x-y+z-2=0\ a n d\ 3x+2y-z+4=0

Show that the normal to the following planes are perpendicular to each other. x-y+z-2=0\ a n d\ 3x+2y-z+4=0

Find the angle between the plane: x-y+z=5\ a n d\ x+2y+z=9

Find the angle between the plane: x-y+z=5\ a n d\ x+2y+z=9

Find the angle between the plane: 2x-y+z=4\ a n d\ x+y+2z=3

Find the angle between the plane: 2x-y+z=4\ a n d\ x+y+2z=3

Show that the planes 2x+6y-6z=7\ a n d\ 3x+4y+5z=8 are at right angles.

Show that the planes 2x+6y-6z=7\ a n d\ 3x+4y+5z=8 are at right angles.

Find the angle between the plane: 2x-3y+4z=1\ a n d-x+y=4.