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A line is perpendicular to both the x-axis and the y-axis. Its direction cosines are:
A(0, 0, 1) or (0, 0, -1)
B(1, 1, 0) or (-1, -1, 0)
C(0, 1, 0) or (0, -1, 0)
D(1/2, 1/2, 0) only
Answer & Solution
Correct answer: A. (0, 0, 1) or (0, 0, -1)
Zero cosines with x and y force the z cosine to be plus or minus 1.
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