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
360 degrees
180
360
35
180
360 degrees
180
720
360
360
35
180
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.
1260
Sum= 2340 Degrees A+
1,080