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четырехугольники

QuestionAnswer
Четырехугольник, у которого стороны попарно параллельны и равны параллелограмм
параллелограмм, у которого все стороны равны ромб
параллелограмм, у которого все углы прямые прямоугольник
прямоугольник, у которого все стороны равны квадрат
четырехугольник, у которого две стороны параллельны, а две другие не параллельны трапеция
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