It called Icosikaioctagon.
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A 28-sided shape is called an icosikaioctagon. The prefix "icosi" denotes 20 sides, and the suffix "-octagon" denotes 8 sides, combining to form the name for this polygon. It is a type of polygon known as a polygon with 28 sides.
a shape with equal sides
A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
The Shape That Has 8 Sides Is A Octagon Which Has 8 Equal Sides
shape no pairs of perpendicular sides