The sum of the internal angles of a regular polygon with n sides is (n - 2) x 180 degrees. Therefore, the sum of the internal angles of a 14-sided shape (a tetrakaidecagon) is (14 - 2) x 180 = 2160 degrees.
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"The sum of an angle"? If you ask like a lesstard* then you might get an answer. *lesstard<motard<retard
The 3 interior angles of a triangle add up to 180 degrees
That is a regular octogan (8 sided shape)
It is an 11 sided polygon whose interior angles add up to 1620 degrees
The interior angles of any shape besides a triangle will add up to 360 degrees.