Let \(l,m,n\) be the direction cosi

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Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Three-dimensional Geometry

Question:

Let \(l,m,n\) be the direction cosines of a line. Then which of the following relation is there

Options:

\(l^2+m^2+n^2=1\)

\(l^2+m^2+n^2=2\)

\(l^2+m^2+n^2\) can be any natural number

\(l^2+m^2+n^2\) is an irrational number

Correct Answer:

\(l^2+m^2+n^2=1\)

Explanation:

Recall \(l^2+m^2+n^2=1\)