parallelogram

• n. 平行四边形
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parallelogram 平行四边形

parallelogram (n.)
1560s, from Middle French parallélogramme (1550s) and directly from Late Latin parallelogrammum, from Greek parallelogrammon noun use of neuter adjective meaning "bounded by parallel lines," from parallelos (see parallel) + stem of graphein "to write" (see -graphy).
1. These are the opposite sides of the parallelogram.

2. This construction is often called the parallelogram law of addition of vectors.

3. We can show that u ( x, t ) can be determined at every point inside the parallelogram OACB.

4. The little parallelogram above your top lip is called the filtrum.

5. Teacher: The shape of the parallelogram has changed. What about its perimeter?