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Question Practice

If a line has direction ratios a, b, c, what value of k is derived from the formula l² + m² + n² = 1?

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

If a line has direction ratios...

Single Answer MCQ
Q-00078349

If a line has direction ratios a, b, c, what value of k is derived from the formula l² + m² + n² = 1?

1

√(a² + b² + c²)

2

a + b + c

3

2a + 2b + 2c

4

a² + b² + c²

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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.

Q1.

What are the direction cosines of a line?

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Q2.

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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Q3.

What do direction ratios represent for a line in three-dimensional space?

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Q4.

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

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