A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.
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A decagon
Exterior angles: 360 Interior angles: 1440
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
It will have (1440+360)/180 = 10 sides which is a decagon
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 1440 degrees