They are quadrilaterals; opposite sides are parallel.
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Parallelograms are squares is sometimes true. Squares are parallelograms is always true. Rhomboids are parallelograms is also always true. So not all parallelograms are squares but some are.
Yes because all parallelograms have four sides. But the opposite is not true. There are some quadrilaterals that aren't parallelograms.
In fact, some are rectangles, but not all are.
Yes it's true.
The sentence "this shape has five sides" is not true for all parallelograms.