Question

Question #c890c

Answer 1

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= 1980/180=11`

add 2:

`n=11+2=13`

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