The interior angles of a 10 sided shape add up to 1440 degrees
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The interior angles of a ten sided decagon add up to 1440 degrees
A decagon is a 10 sided polygon whose interior angles add up to 1440 degrees
A decagon is a polygon with 10 sides and 10 angles. Deca is from the Greek meaning of "ten".
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The sum of the angles in a nonagon total 1260 degrees.