Direction ratios: $(4-1, 6-2, 3-3) = (3, 4, 0)$
$|DR| = \sqrt{9+16+0} = 5$
Direction cosines: $\frac{3}{5}, \frac{4}{5}, 0$
Back to JEE Main 2022 Vectors & 3D Geometry
JEE Main 2022 — Mathematics Vectors & 3D Geometry
medium
mcq
2022
Official previous-year question
Verified 30 May 2026.
Question
The direction cosines of the line joining points $(1,2,3)$ and $(4,6,3)$ are:
Options
- A
$\frac{3}{5}, \frac{4}{5}, 0$
- B
$\frac{3}{5}, \frac{4}{5}, \frac{1}{5}$
- C
$\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}, 0$
- D
$\frac{1}{3}, \frac{2}{3}, 0$
Solution
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