Parallelogram
A parallelogram is a plane figure of four sides whose opposite sides are parallel. A rhombus is a parallelogram with all four sides of equal length; a rectangle is a parallelogram whose adjacent sides are perpendicular; and a square is a parallelogram whose adjacent sides are both perpendicular and equal in length.
The area of a parallelogram is equal to the length of its base times the length of its altitude.
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