If a line makes angles of 90°, 135° and 45° with the x, y and z axes respectively, then its direction cosines are

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MCQ (Single)Direction Cosines of a LineCBSE PYQ

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If the direction cosines of a line are √3 k, √3 k, √3 k, then the value of k is :

Assertion (A) : A line in space cannot be drawn perpendicular to x, y and z axes simultaneously. Reason (R) : For any line making angles, α, β, γ with the positive directions of x, y and z axes respectively, cos² α + cos² β + cos² γ = 1.

Assertion-ReasonThree Dimensional Coordinate System