an Octagon
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Extend any straight side of a shape. The angle made by that side with the adjacent side of the shape is an exterior angle. Its value is 180 degrees less the interior angle.
I guess 13 angle shape
An 8-sided shape is called an octagon. The term "octagon" is derived from the Greek words "octa," meaning eight, and "gonia," meaning angle. In geometry, an octagon has eight straight sides and eight angles, with each angle measuring 135 degrees.
The apothem is the distance from the center to the middle of any side on a regular polygon. That is, a shape with every single side and angle the same.
side- angle- side