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单词 parallelogram
释义 parallelogram
n. Geom. a four-sided plane rectilinear figure with opposite sides parallel.
Phrases and idioms
parallelogram of forces
  1. 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. this theorem.
Etymology: F parall{eacute}logramme f. LL parallelogrammum f. Gk parallelogrammon (as PARALLEL, gramme line)
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