A decagon
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A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
A decagon is a 10 sided polygon whose interior angles add up to 1440 degrees
Its interior angles are: (10-2)*180 = 1440 degrees If its a regular 10 sided polygon then each interior angle is: 1440/10 = 144 degrees
Exterior angles add up to 360 degrees Interior angles add up to 1440 degrees