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All parallelograms are quadrilaterals, though not all quadrilaterals are parallelograms. Both have 4 sides and 4 corners. A quadrilateral can have sides and corners of different sizes, whereas a parallelogram must have opposite sides that are parallel.

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Q: Why is a quadrilateral sometimes a parallelogram?
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Related questions

Are all parallelograms a quadrilaterals always sometimes or never?

-- A parallelogram is always a quadrilateral. -- A quadrilateral is sometimes a parallelogram.


If one diagonal of a quadrilateral bisects the other when is the quadrilateral a parallelogram?

In this case, the quadrilateral is sometimes a parallelogram.


Why is a parallelogram always a quadrilateral but a quadrilateral is only sometimes a parallelogram?

A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.


Is a quadrilateral sometimes a parallelogram?

Absolutely; a parallelogram is a form of quadrilateral, in that it has four sides. If the four sides come in two sets of parallel lines, you have a parallelogram.


If one pair of opposite sides of a quadrilateral is congruent when is the quadrilateral a parallelogram?

sometimes


What is another name for a quadrilateral?

polygon, sometimes a parallelogram


Is a parallelogram always, never, or sometimes a quadrilateral?

Always


Is a parallelogram sometimes a quadrilateral?

Yes. Parallelograms are always quadrilaterals.


What are all of the ways that a rectangle can be classified?

An oblong, a quadrilateral and sometimes a parallelogram


What is the ways to prove that a quadrilateral is a parallelogram?

If it is a parallelogram, then it has two sets of parallelogram sides. Parallelograms' opposite angles are congruent A parallelogram's bisectors are congruent. * * * * * A parallelogram's bisectors are NOT congruent.


What is a quadrilateral parallelogram?

A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.


What shape is a parallelogram but not a quadrilateral?

A shape that is a parallelogram but not a quadrilateral doesn't exist.