If you draw a 9-gon and then draw from one vertex all the possible triangle to the other vertices you'll get 7 triangles. Multiply 7 times 180, the number of interior ange measure, and you'll get your answer. 1260
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∙ 13y ago360 degrees
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The sum of the measures of the angles in a figure having 9 sides is 20 degrees each angle.
If it's a regular 9 sided polygon then each interior angle will measure 140 degrees.
Sum= 2340 Degrees A+
The sum of the measures of the interior angles of any quadrilateral is 360.(S-2)*180 equals the sum.
1,080