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It must have only one set of parallel lines.
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What attribute makes a parrallelogram a special trapezoid?
A trapezoid is a quadrilateral which must have one pair of parallel sides. If the other pair of sides is also parallel then it is a parallelogram.
Is every quadrilateral a trapezoid?
No, not every quadrilateral is a trapezoid, although a trapezoid is also a quadrilateral because it has four sides.
Is a trapezoid also a quadrilateral?
Yes a trapezoid is a quadrilateral. Quadrilateral means "four sided", and trapezoids have four sides.
Is a trapezoid always a quadrilateral?
No. A quadrilateral is any four-sided figure. A trapezoid is one example of a quadrilateral.
Why is a trapezoid a quadrilateral but a quadrilateral is not a trapezoid?
For the same reason that a cat is an animal but an animal is not always a cat. Because a trapezoid is a special kind of quadrilateral. A quadrilateral is anything with four sides. A trapezoid has four sides, and also two of them are parallel to each other. Therefore some quadrilaterals are trapezoids, but most of them aren't.
