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2015-11-05T21:20:28+08:00

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Always true, a quadrilateral is a parallelogram. Remember the theorem: if a parallelogram is quadrilateral the two pairs of opposite sides are congruent.
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It should be reversed: "If the quadrilateral has two pairs of congruent parallel sides, then it is parallelogram." Trapezoid is a quadrilateral that do no satisfy the condition of parallelogram. Therefore, not all quadrilaterals are parallelogram. So the answer is: Sometimes true :-) Good day :-)
Ahh okay but it should be based on our lesson. I will clarify to my teacher.
You can also reverse that theorem depending on the given :-) thanks :-)
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2015-11-05T22:37:44+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Sometimes true.

A quadrilateral is a polygon with four sides.  

A parallelogram is a quadrilateral with two pairs of opposite sides parallel.

Not all quadrilaterals are parallelogram.  Examples are trapezoid and trapezium.
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