360 degrees
1,080
Sum= 2340 Degrees A+
180
The answer depends on what it is that is being summed: the length of the sides or diagonals, the angle measures, something else.
1260 degrees
2340
1260 degrees
1260 degrees
360 degrees
180
There is no regular polygon with an interior angle of 20o. If the interior angle is 120o then there are six sides and the sum of the angles is 720o.