parallelogram
/ˌpærəˈleləʊgræm/noun
- a four-sided plane rectilinear figure with opposite sides parallel平行四边形。
短语
parallelogram of forces
- 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力的平行四边形。
词源
late 16th cent.: from French parallélogramme, via late Latin from Greek parallēlogrammon, from parallēlos 'alongside another' + grammē 'line'.