A supplementary angle is the one you would add to an angle to bring the total to 180°, In this that would be 15°.
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180 deg - 165 deg 12 min
There are two answers; measuring clockwise is 165 degrees anticlockwise is 195
If each interior angle is 165 degree then it's a regular polygon with 24 sides
If its a regular polygon and each interior angle is 165 degrees then it has 24 sides
Providing that it is a regular 24-agon then each interior angle measures 165 degrees