Home › CBSE Class 12 (Commerce) › Mathematics › Three Dimensional Geometry › Reversing the direction of a directed line in sp…
Reversing the direction of a directed line in space makes its direction cosines:
Astay unchanged
Bget inverted
Creverse in sign
Dturn into zero
Answer & Solution
Correct answer: C. reverse in sign
Each direction angle becomes its supplement, and the cosine of a supplement is the negative of the cosine.
Related questions
A line with direction ratios (1, 2, 2) is perpendicular to the line with ratios:Parametric equations x = 1 + 2λ, y = 3 - λ, z = 4λ give direction ratios:The line r = (2i - j + 4k) + λ(i + 2j - k) has direction ratios:How many straight lines pass through two distinct points in space?What is the length of the segment from P(-2, 4, -5) to Q(1, 2, 3)?Lines through two disjoint pairs of four non coplanar points are:A unit vector along the common perpendicular of lines with directions b1, b2 is:If (b1 x b2) . (a2 - a1) = 0 for two lines, the lines are: