Relation between the direction cosines of a line, Direction cosines of a line passing through two points
- Three Dimensional Geometry Part 1- Direction Ratios
undefined video tutorial00:33:19
- 3D Geometry Straight Line Part 01 (Direction ratio, Direction Cosines)
undefined video tutorial00:41:23
- 3 Dimensional Geometry part 3 (Example:- Direction cosine, ratio)
undefined video tutorial00:10:24
- 3 Dimensional Geometry part 4 (Example:- Direction cosine, ratio)
undefined video tutorial00:07:29
- 3 Dimensional Geometry part 2 (Direction Cosine, Ratios)
undefined video tutorial00:14:57
If l1, m1, n1 and l2, m2, n2 are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are m1n2 − m2n1, n1l2 − n2l1, l1m2 − l2m1.
If a line makes angles 90°, 135°, 45° with x, y and z-axes respectively, find its direction cosines.
If the lines `(x-1)/(-3) = (y -2)/(2k) = (z-3)/2 and (x-1)/(3k) = (y-1)/1 = (z -6)/(-5)` are perpendicular, find the value of k.
Find the vector equation of the plane passing through (1, 2, 3) and perpendicular to the plane `vecr.(hati + 2hatj -5hatk) + 9 = 0`
Find the Direction Cosines of the Sides of the Triangle Whose Vertices Are (3, 5, -4), (-1, 1, 2) and (-5, -5, -2)