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The direction cosines l, m, n with respect to ____ x-, y-, z- axes respectively.

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The direction cosines l, m, n with respect to ____ x-, y-, z- axes respectively.

(a) Local

(b) Local and global

(c) Global

(d) Transformation

This question was posed to me during an online interview.

This interesting question is from Three Dimensional Trusses topic in section Trusses of Finite Element Method

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Correct option is (c) Global

Easy explanation: The direction cosines of a vector are the cosines of the angles between the vector and three co-ordinate axes. Direction cosines are analogous extension of the usual notion of the slope and higher dimensions. The direction cosines l, m, n are with respect to global x-,y-, z- axes .

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