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A line joins (1, 2, 3) and (4, 6, 15). Its direction cosines are
A3/11, 4/11, 12/11
B3/13, 4/13, 12/13
C3/5, 4/5, 12/5
D1/13, 2/13, 3/13
Answer & Solution
Correct answer: B. 3/13, 4/13, 12/13
The differences are 3, 4, 12 and the length is √(9 + 16 + 144) = 13.
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