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Question

The direction cosines of the line drawn from P(–5, 3, 1) to Q(1, 5, –2) is

A
(6,2,3)
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B
(2,4,1)
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C
(4,8,1)
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D
(67,27,37)
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Solution

The correct option is D (67,27,37)
DR’s of PQ are 1 – (–5), 5 – 3, – 2 – 1
ie., 6, 2, –3
and 62+22+(3)2=7DCs are67,27,37

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