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Direction Cosines

The direction...

Question

The direction ratios of the line joining the points $(4, 3, - 5)$ and $(- 2, 1, - 8)$ are

A

\frac{6}{7}, \frac{2}{7}, \frac{3}{7}

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B

6, 2, 3

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C

5, 8, 0

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D

3, 7, 9

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Solution

The correct option is D $6, 2, 3$
Given points $P (4, 3, - 5)$ $Q (- 2, 1, - 8)$
Direction ratios of $P Q$
$=$ Position vector of $P -$ Position vector of $Q$
$= 4 - (- 2), 3 - 1, - 5 - (- 8)$
$= 6, 2, 3$

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