Question

the sum of the polygon is 1980 degree .what is the sum of the angles of a polygon with one side less? what about a polygon with one side more​

Answer 1

Sum of angles of a polygon with one side less = (12-2)x180 = 1800

Sum of angles of a polygon with one side more​ = (14-2)x180 = 2160

Explanation:

(n-2)x180 = 1980

n = 13

Sum of angles of a polygon with one side less = (12-2)x180 = 1800

Sum of angles of a polygon with one side more​ = (14-2)x180 = 2160