Special cases
Overview
Important
Special cases of parallelograms are quadrilaterals that satisfy additional conditions beyond those of general parallelograms. The most common special cases are rectangles, squares, and rhomboids.
Important properties
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A rectangle is a parallelogram with four right angles.
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A square is a parallelogram with four right angles and four equal sides.
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A rhomboid is a parallelogram with opposite sides equal and angles not right angles.
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All rectangles and squares are parallelograms, but not all parallelograms are rectangles or squares.
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Diagonals in rectangles and squares are equal in length; in rhomboids, they are not.