All 4-sided polygons are quadrilaterals
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A quadrilateral
A quadrilateral
A tangential quadrilateral is a four sided polygon such that each of its sides is tangent to the same circle.
A quadrilateral
I believe you are looking for the word quadrilateral. http://en.wikipedia.org/wiki/Polygon#Naming_polygons http://en.wikipedia.org/wiki/Quadrilateral