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* Adjacent angles sum to 180<sup>0</sup>
* Adjacent angles sum to 180<sup>0</sup>
* It has rotational symmetry of order at least 2.
* It has rotational symmetry of order at least 2.
* Its area is equal to its base multiplied by its vertical height
The set of [[rhombus|rhombuses]] is a subset of the set parallelograms.
The set of [[rhombus|rhombuses]] is a subset of the set parallelograms.
[[category:geometry]]
[[category:geometry]]