The angle between the plane `3x+4y=0` and z-axis is (A) `0^0` (B) `30^0` (C) `60^0` (D) `90^0`

The angle between the plane 3x+4y=0 and the line x^2+y^2=0 is (A) 0^0 (B) 30^0 (C) 60^0 (D) 90^0

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

The angle between the lines 2x=3y=-z and 6x=-y=-4z is (A) 0^0 (B) 90^0 (C) 45^0 (D) 30^0

The angle between a line x=1,y=2 and y+1=0, z=0 is (A) 0^0 (B) 30^0 (C) 60^0 (D) 90^0

The angle between the planes 4x + 8y + z- 8 = 0 and y + z -4 = 0 is (A) 30 ° (B) 45 ° (C) 60 ° (D) 90 °

Find the angle between the planes x+y+z+1=0 and x-y+z-1=0 .

Find the angle between the planes 3x+y+2z=1 and 2x-y+z+3 = 0 .

If a line makes angle 35^0 and 55^0 with x-axis and y-axis respectively, then the angle with this line makes with z-axis is (A) 35^0 (B) 45^0 (C) 55^0 (D) 90^0