Геометрия
Площади фигур
Площадь трапеции
  где h - высота, a, b - основания трапеции.  , где h - высота, m - средняя линия.  . Если в трапецию можно вписать окружность радиуса r, то  , где P - периметр трапеции. Некоторые свойства трапеции
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