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The interior angles of a 19 sided polygon add up to 3060 degrees
The sum of the exterior angles of any polygon is always 360 degrees. In a 19-sided polygon, each exterior angle would be 360/19 = 18.9474 degrees. Therefore, the sum of the exterior angles of a 19-sided polygon would be 19 * 18.9474 = 360 degrees.
n-gon
nontagon, or you can just say polygon
There are many options. Some of these are: A pyramid with a base that is a 19 sided polygon; A dipyramid with a "centre" that is an 18 sided polygon; A prism with decagonal bases.