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

tridecagon/triskaidecagon

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.

the central idea is that:

individuals should refuse to cooperate with institutions they believe unjust.

thoreau felt  that governments were more often agents of corruption than justice, even democracies, and that just because the majority feels a certain way does not make it just or correct in absolute terms. he uses the fact that slavery exists in our democracy to support this idea.

he goes on to say that, as a result, people should live true to their own internal laws regarding right and wrong, as a product of reflection and a moral life, rather than following every law that society imposes. 

step-by-step explanation:

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)