Some are, and some are not. A parallelogram is a special kind of quadrilateral ...
one in which every side is parallel to the one across from it.
So all parallelograms are quadrilaterals, but there are also a lot of other quadrilaterals
that are not parallelograms.
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Yes because all parallelograms have four sides. But the opposite is not true. There are some quadrilaterals that aren't parallelograms.
Parallelograms!
No but they are all quadrilaterals
They are quadrilaterals; opposite sides are parallel.
Quadrilaterals do not bisect each other. They could in special cases. In parallelograms (types of quadrilaterals), the diagonals bisect each other.