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Which triple can be the direction cosines of a line?
A(1, 1/2, 1/2)
B(1/2, 1/2, 1/2)
C(1/2, 1/2, 1/√2)
D(1/3, 1/3, 1/3)
Answer & Solution
Correct answer: C. (1/2, 1/2, 1/√2)
Only 1/4 + 1/4 + 1/2 sums to 1, which is the required condition.
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