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 lines x=1, y=2 and y=-1, z=0 is

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

The angle between the planes x + y = 0 and y - z = 1 is

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

Let the straight lines x+y-2=0, 2x-y+1=0 and px+qy-r=0 be concurrent and l_1 and l_2 be the two members of the family of lines 2px+2qy+4r=0 which are nearest and farthest from origin : Now answer the question : The angle between lines L_1 and l_2 is : (A) 45^0 (B) 60^0 (C) 90^0 (D) none of these

The angle between the lines 5x+3y-7=0\ a n d\ 15 x+9y+14=0 is a. 0^0 b. 60^0 c. 45^0 d. 30^0

The angle between the regression lines: x-2y+3=0, 4x-5y+1=0 is

The acute angle between the planes 2x-y+z=6\ a n d\ x+y+2z=3 is 45^0\ b. 60^0 c. 30^0 d. 75^0

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