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Which of the following is true about direction ratios (a, b, c) and direction cosines (l, m, n)?

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MCQ_SA

Single Answer MCQ

Q-00078339

a = λl, b = λm, c = λn

a = l/n, b = m/l, c = n/m

a + b + c = 1

l + m + n = 1

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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?

Q3.

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Q4.

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