a) z’- axes
b) x’- axes
c) y’- axes
d) None of the above
Answer: b
Explanation: Direction cosine refers to the cosine of the angle between any two vectors and three co-ordinate axes. Direction cosines are analogous extension of the usual notion of the slope to higher dimensions. In a truss element the direction cosines l, m, n are of local co-ordinate of x’- axes.
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