The answer depends on what you wish to measure: the area, the number of sides, the number of vertices, the sum of the interior angles, the sum of exterior angles, ...
The question is hopelessly underspecified.
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the sum of the interior angles of a 35-gon.
3,600°
9000
6120 degrees
Sum of interior angles of a n-gon is 180*(n-2) So for a 10-gon (decagon), the sum would be 180*8 = 1440 degrees. That is true whether the polygon is convex or not (as long as its sides do not intersect).