A decagon is a 10 sided polygon whose interior angles add up to 1440 degrees
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The interior angles of a 10 sided shape add up to 1440 degrees
The interior angles of a ten sided decagon add up to 1440 degrees
A decagon is a polygon with 10 sides and 10 angles. Deca is from the Greek meaning of "ten".
A decagon has 10 sides
it is a ten sided and ten angled figure