Students and teachers of secondary school

On some properties and criterions of a parallelogram, finished

Al. A. Privalov<sup>ab

a</sup> ГБОУ г. Москвы “Школа на Юго-Востоке имени Маршала В.И. Чуйкова”
^b Moscow State Automobile and Road Technical University

Abstract: Some properties of a parallelogram are considered and some conditions are established under which the properties become criterions. The end of the article.

Keywords: parallelogram, parallelogram properties, parallelogram signs.

UDC: 514.112.4