Question

The sum of the measure of the interior angles of a polygon is 1980°. What polygon is it?

Answer 1

Answer:

tridecagon/triskaidecagon

Explanation:

sum of interior angles= 180(n−2) degrees, n being the number is sides in the polygon.

sum of interior angles= 1980

180(n−2)=1980

divide by 180:

n−2=1980180=11

add 2:

n=11+2=13

If a polygon has 13 sides, it is called a tridecagon or a triskaidecagon.