Teaching DSSSB TGT Mock Test 2025 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
Under which condition a straight line \(\frac {x - x_0}{l} = \frac {y - y_0}{m} = \frac {z - z_0}{n}\) is parallel to the xy - plane?
1
l = 0
2
m = 0
3
n = 0
4
l = 0, m = 0