## Conceptual Physics (12th Edition)

A pair of one-pound forces at right angles will have a resultant of $\sqrt 2$ pounds, along the line that is halfway between the two forces.
This is found by the parallelogram rule (page 29). $$(1 lb)^{2} + (1 lb)^{2}=x^{2}$$ $$x=\sqrt 2 lb$$