The Total solution for NCERT class 6-12
If aline makes angles of 90°, 60° and 30° with the positive direction of x,y and z-axis respectively, find itsdirection cosines.
Answer - 1 : -
Let l,m and n be the direction cosines of a line.
l = cos 90° =0
If aline has direction ratios 2, -1, -2, determine its direction cosines.
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Findthe direction cosines of the line passing through two points (-2, 4, -5) and(1, 2, 3).
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Usingdirection ratios show that the points A (2,3, -4), B (1,-2, 3) and C (3,8, -11) are collinear.
Answer - 4 : -
Findthe direction cosines of the sides of the triangle whose vertices are (3, 5,-4), (-1, 1, 2) and (-5, -5, -2)
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