A trapezoid, a trapezium, an isosceles trapezoid or trapezium and it is a 4 sided quadrilateral.
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All the names to classify a trapezoid are a trapezoid and a quadrilateral.
quadrilateral , polygon, and probably trapezoid?
polygon & quadrilateral * * * * * That is not really true. A trapezoid is a particular type of quadrilateral and that, in turn, is a particular type of polygon. That does not make them alternative names for a trapezoid.
A trapezoid is a 4 sided quadrilateral which can also take the shape of an isosceles trapezoid and in the UK it is known as a trapezium
A trapezoid is called a trapezium in the UK (because the UK trapezoid is scalene). In any case, a trapezoid is also a quadrilateral, in that it has four sides.