Reaction forces are given in terms of load variable P for the truss below (see boxed expressions next to reaction force arrows) . The force in member FD is: 
Definitions:
Plug Weld
A type of weld used to fasten two pieces of metal together by filling a pre-drilled hole in the top piece with weld material which then attaches to the piece underneath.
Slot Weld
A type of weld used to join pieces of metal together through a slot in one piece that fits over another piece, typically used in sheet metal work.
Depth of Filling
The extent to which a cavity or mold is filled with material during a manufacturing or casting process.
Spur Gears
A type of gear with straight teeth mounted on a parallel shaft, used for transmitting motion and torque.
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