calculate the sum of interior angles of a convex 13-gon
3240
3060
2340
1980
or none
The formula for the sum of interior angles in a convex polygon is (n-2) x 180, where n is the number of sides.
Therefore, for a 13-gon, the sum of interior angles would be:
(13-2) x 180 = 11 x 180 = 1980
So the answer is 1980.