Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 522
are seldom concernedwith the actual paths. Let A be the initial position of the object in the room;draw AC parallel and equal to ac, and similarly directed,then C is the final position of the object. The law of the triangle is of fundamental importance;two vector quantities of any like kind are… … ps are similarly directed in the triangle, and also the two^s ; that these directions are with the motion of a pointwhich travels round either triangle against the resultant ac.This last property may be expressed by saying that in eithertriangle the components p and q are circuital, and…