The sum of the interior angles of a polygon with n sides is 1980°. Find n.

n = 13

Step-by-step explanation:

The sum of the measures of the interior angles of an n-sided polygon is

(n - 2) 180

Set (n - 2) 180 equal to 1980 and solve for n.

(n - 2) 180 = 1980

Divide both sides by 180.

n - 2 = 11

Add 2 to both sides.

n = 13

Step-by-step explanation:

The sum of the angles of any polygon with 'n' sides is (n - 2) times 180 degrees. 1980 / 180 = 11, so the polygon has 13 sides and 13 angles. If the polygon is regular, then all the angles are equal. Each interior angle is 1980/13 = 152.308 degrees (rounded