Question

Find the direction cosines of the line segment joining the points A(2, 5, 7) and B (3,2,5) .

Answer 1

Direction ratios = (a, b, c) = (1, –3, –2)

Direction cosines = (l, m, n) = $(\frac{1}{\sqrt{14}},\frac{-3}{\sqrt{14}},\frac{-2}{\sqrt{14}})$