Exterior angle measures 18 degrees Interior angle measures 162 degrees
Providing that it's a regular polygon then its interior angles will add up to 1260 degrees with each of its 9 interior angles measuring 140 degrees.
Providing that it is a regular hexagon then the each interior angle measures 120 degrees and each exterior angle measures 60 degrees
Each exterior angle measures 20 degrees Each interior angle measures 160 degrees
Interior angle = 120 degrees Exterior angle = 60 degrees
Subtract the interior angle by 360 degrees
Each interior angle measures 150 degrees Each exterior angle measures 30 degrees
Providing that it is a regular nonagon then each exterior angle measures 40 degrees and each interior angle measures 140 degrees