A polygon with 35 sides and angles
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33 triangles
In general an n-gon has n sides. Therefore, a 123-gon would have 123 sides.
If its a regular 45-gon it is 8 degrees.
The sum of the interior angles of a n-gon is (n-2)*180 degrees. So the sum of the int angles of a 25-gon is 23*180 = 4140 degrees. If the 25-gon is regular, then each of its interior angles is equal. In this case, it is 4140/25 = 165.6 degrees.
Providing that it is a regular 16-gon each exterior angle measures 22.5 degrees.