Not only convex, but all decagons:
decagons have 10 sides implies Sum = (10-2)*180o = 1440o.
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1440
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).
the sum of the interior angles of a 35-gon.
3,600°
1440 degrees. The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees.