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perimeter of a parallelogram is 2(a + b) where a and b are the lengths of adjacent sides.
*Unlike any other convex polygon, a parallelogram cannot be inscribed in any triangle with less than twice its area.
*The centers of four squares all constructed either internally or externally on the sides of a parallelogram are the vertices of a square.
*If two lines parallel to sides of a parallelogram are constructed concurrent to a diagonal, then the parallelograms formed on opposite sides of

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