think your thinking of quadrilateral
A four-sided shape
The likely word is quadrilateral, a four-sided polygon (flat shape).
The word you're looking for is.... oblong. An alternative word for a rectangle.
A synonym for a quadrilateral is a square.
The word form for 13.406 is "thirteen and four hundred six thousandths".
There are four phonemes in the word "thirteen": /θ/ /ɜː/ /r/ /tiːn/.
Octagon.
It is a typographic oxymoron.There is no such thing as a quadrangel: the nearest real word is quadrangle and that is a 2-dimensional shape with four sides. It cannot, therefore, be a shape with six sides!
standardizing
Quadrilateral.Quadrangle.There are many names for special cases of four sided planar polygons:SquareRhombusParalellogramTrapezoid...A four faced three dimensional equilateral object is a Tetrahedron.
A pentagon
I would write 13.024 as thirteen and twenty-four thousandths