If a line has ratios 2,1,-2 then it's di

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Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Three-dimensional Geometry

Question:

If a line has ratios 2,1,-2 then it's direction cosines will be-

Options:

-2/3, 1/3, -2/3

2/3, 1/3, 2/3

2/3, -1/3, -2/3

2/3, 1/3, -2/3

Correct Answer:

2/3, 1/3, -2/3

Explanation:

Direction cosines are-

2/√{(2)² +(1)² + (-2)²}, 1/√{(2)² +(1)² + (-2)²}, -2/√{(2)² +(1)² + (-2)²}

2/3, 1/3, -2/3