A four-sided polygon whose sides are all equal and whose
angles are all equal has all of the following names:
-- square
-- rectangle
-- rhombus
-- parallelogram
-- quadrilateral
it doesnt have a name if it has the name is square
quadrilaterals
well there are quadrilaterals, the 4 sided polygons. There's parallelogram,trapezoid,isosceles trapizod rhombus,rectangle,square
They are 4 sided quadrilaterals
All of them are both quadrilaterals and quadrangles. That's two names!
Triacontagon
ennedagon
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A polygon is a quadrilateral. So examples would be a rectangle, parallelogram, Rhombus, square, trapezoid, kite.
There are too many 4-sided polygons which satisfy those requirements and there is no specific name for them.
It's quite acceptable to call them 20-29agons but what's more important is knowing how to work out their properties
icosikaidi is the name for a 22 sided polygon. For a list of the names for polygons, see the related link.