| 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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