Students and teachers of secondary school

On some properties and criterions of a parallelogram

Al. A. Privalov<sup>ab

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

Abstract: Some properties of a parallelogram are considered and some conditions are established under which the properties become criterions. To be continued.

Keywords: properties of a parallelogram, signs of a parallelogram.

UDC: 514.112.4