A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
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It is a 10 sided decagon polygon
The sum of the exterior angles of ANY polygon is 360 degrees.
Interior angles of any n-sided polygon total (2n - 4) right angles or 180n - 360 degrees. When n = 10 this works out as 1440o.
Exterior angles: 360 Interior angles: 1440
A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.