It is one plane shape consisting of four straight sides (and four vertices).
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British definition differs with USAUSATrapezoidA quadrilateral with one pair of parallel sidesTrapeziumA quadrilateral with no sides parallelBritishTrapezoidA quadrilateral with no sides parallelTrapeziumA quadrilateral with one pair of parallel sides
No. It can also be a kite.If one pair of adjacent sides of a parallelogramare congruent, then the quadrilateral is a rhombus.
A quadrilateral is a 4 sided polygon with one flat face
It's a quadrilateral. There's no other name for it.
Answer: A regular quadrilateral is one with equal sides and equal angles, so it is a square. To negate this definition, we say an irregular quadrilateral is one where the sides are unequal or the angles are unequal OR BOTH. In simpler terms, we could say it is a quadrilateral which is not a square.