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triskaideka as in triskaidekaphobia - the fear of the number thirteen or a 13-sided polygon can either be called a triskaidecagon or a tridecagon.
13 * (180 - 360/13) = 1980 degrees
Loafing shed or hay shed. It is a Dutch Barn in the UK
A link to a picture of a regular tridecagon (also known as a triskaidecagon), a thirteen-sided polygon, can be found below this answer.
A thirteen-sided polygon is called a triskaidecagon - from the Greek "tri", meaning 3, the connector "kai" - used in names of polygons of ten sides or more, "deka", meaning 10, and "gonus", meaning angle.