A decagon is a 10 sided polygon.
Exterior degrees total 360
Interior degrees total 1440
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The interior angles of a decagon add uo to 1440 degrees
The angles of any triangle add to 180 degrees. Whether or not the triangle is in a decagon is totally irrelevant.
A decagon is a 10 sided polygon Exterior angles add up to 360 degrees Interior angles add up to 1440 degrees It has 35 diagonal A decagon can have a regular or an irregular shape
It has 10 interior angles that add up to 1440 degrees
It has 10 interior angles that add up to 1440 degrees