Question

What is the sum of the measures of the angles of this 9-sided polygon?

1080
1260
1440
1620​

Answer 1

Add all the sides.
It will help.

Answer 2

1260

Explanation:

Sum of all the angles of a polygon = (n - 2)*180

Sum of all the angles of a 9-sided polygon = (9-2)*180

= 7 * 180 = 1260