Here's the question you clicked on:
webbbiee
Remember to show all of the steps that you use to solve the problem. Find the sum of the measures of the interior angles of the figure.
It is determined by the number of sides. From geometry, a straight line is equal -- how many degrees? For example, a triangle is three sides and you know how much the angles total to.
I didn't do a good job of explaining that, there is a formula for finding total degree of angles an n-sided polygon, it is (n-2)*120
It's 180(n - 2), where n is number of sides. The number is 180 not 120.