a) x2-x1
b) \(\frac{x_2}{l_e}\)
c) \(\frac{x_1}{l_e}\)
d) \(\frac{x_2-x_1}{l_e}\)
Answer: d
Explanation: A truss is a two node element which allows arbitrary orientation in XYZ co-ordinate system. Planar truss is one where all the members and nodes lie within two dimensional plane.
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