(number of sides -2)*180 = sum of interior angles
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A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.
30 sides
A heptagon is a seven-sided polygon. It has seven interior angles. If it is a Regular polygon, each interior angle measures approximately 128.57 degrees, to a total of 900 degrees.
A heptagon is a 7 sided polygon whose 7 interior angles add up to 900 degrees.