A nonagon or a polygon with 9 sides.
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9099 * * * * * The sum of the interior angles is (9 - 2)*180 = 1260 degrees.
We solve the equation for n... since the sum of the interior angles is 180(n-2) where n is the number of sides of the polygon. So we have: 180(n-2)=1260 n-2=7 n=9 So 9 sides
It is a regular 9 sided polygon whose 9 interior angles add up to 1260 degrees
It is a nonagon whose 9 interior angles add up to 1260 degees
It is a 9 sided nonagon whose interior angles add up to 1260 degrees