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1. Oxford Dictionary

   parallelogram of forces

   • ph.
     a parallelogram illustrating the theorem that if two forces acting at a point are represented in magnitude and direction by two sides of a parallelogram meeting at that point, their resultant is represented by the diagonal drawn from that point
2. • 更多解釋

   parallelogram of forces

   • ph.
     a parallelogram illustrating the theorem that if two forces acting at a point are represented ...

   Oxford American Dictionary