The interior angles of a fifteen sided polygon amount to 2340 degrees.
15
There are 720 degrees in a 6 sided polygon.
The degrees in a 19 sided polygon add up to 3,060 degrees
The interior angles of a 13 sided polygon add up to 1980 degrees
1800 degrees (that is the sum of the internal angles of the 12-sided polygon).
2340 degrees would be in a 16 sided polygon.
1,440 Degrees
If the interior angle measures 156 degrees, this means that the exterior angle is equal to 180 - 156 = 24 degrees. Dividing this by the full 360 degrees of a circle, gives 360/24 = 15. The polygon therefore has fifteen sides. A fifteen-sided polygon is called a pentadecagon or pentakaidecagon.
700
180
106
180