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A line makes angles 90, 60 and 30 degrees with the x, y, z axes. Its direction cosines are:
A0, √3/2, 1/2
B1, 1/2, √3/2
C0, 1/2, 1/2
D0, 1/2, √3/2
Answer & Solution
Correct answer: D. 0, 1/2, √3/2
Taking cos 90 = 0, cos 60 = 1/2 and cos 30 = √3/2 gives l, m, n directly.
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