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Từ điển American Heritage Dictionary 4th
perimeter
pe·rim·e·ter (pə-rĭmʹĭ-tər)n. 1. Mathematics. a. A closed curve bounding a plane area. b. The length of such a boundary. 2. The outer limits of an area. See Synonyms at circumference. 3. A fortified strip or boundary usually protecting a military position. [Middle English perimetre, from Latin perimetros, from Greek : peri-, peri- + metron, measure; see meter2.] per'i·metʹric (pĕr'ə-mĕtʹrĭk) or per'i·metʹri·cal (-rĭ-kəl) adj.per'i·metʹri·cal·ly adv.
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