Geometry of Deformation – Members (1) & (2)  
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The figure shows the rigid bar with its left end pinned and its right end inclined downwards. Point B is at a distance of 760 millimeters from point A. Point C is at a distance of 1520 millimeters from point A. The deflections at B and C are v subscript B and v subscript C respectively.

Next, consider how the rigid bar rotation elongates (or contracts) the axial members.