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Question Practice

If a line makes angles α, β, and γ with the x, y, and z axes, respectively, what is true about the direction cosines l, m, n?

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MCQ_SA
CBSE
Class 12
Mathematics
Mathematics Part - II
Three Dimensional Geometry
Question Bank

If a line makes angles α, β, a...

Single Answer MCQ
Q-00078287

If a line makes angles α, β, and γ with the x, y, and z axes, respectively, what is true about the direction cosines l, m, n?

1

l + m + n = 1

2

l² + m² + n² = 0

3

l² + m² + n² = 1

4

l + m + n = 0

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Q1.

What are the direction cosines of a line?

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Q2.

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Q3.

What happens to the direction cosines if the direction of a line is reversed?

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Q4.

If a line does not pass through the origin, how can we determine its direction cosines?

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