Q: Is a quadrilateral sometimes a parallelogram?

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

No. A parallelogram is a special kind of quadrilateral.

It's not a matter of 'finding' it. Either the quadrilateral is a parallelogram,or else it is not one.If the opposite sides of the quadrilateral are parallel, then it's a parallelogram.

The second statement is false.

A quadrilateral is a parallelogram if it has two pairs of (opposite) sides that are parallel.

Related questions

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

In this case, the quadrilateral is 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.

sometimes

polygon, sometimes a parallelogram

Always

Yes. Parallelograms are always quadrilaterals.

An oblong, a quadrilateral and sometimes 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.

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

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

No. A parallelogram is a special kind of quadrilateral.