The exterior angle of a 18 sided shape is 360/18 =20 degrees The exterior angle is always 360 divided by the numbe of sides of that polygon. =) what the hell im i doing answering this?
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exterior angle = 360° ÷ 20 sides = 18° interior angle = 180° - exterior angle = 180° - 18° = 162°
All I can tell you is that a 16 sided shape is called a Hexadecagon
Tetrahaidecahedron
Octadecadron
If those are exterior angles, the exterior angles of any polygon add up to 360. That would be 18 sides.