An angle that is 160 degrees would be an "obtuse" angle. This is because the measurement of degrees exceeds 90. Anything below 90 degrees would be an "acute" angle.
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Each exterior angle measures 20 degrees Each interior angle measures 160 degrees
It has 18 sides
Providing that it is a regular 18 sided polygon each interior angle measures 160 degrees.
An angle that measures 210 degrees is a reflex angle.
Any angle between 90 and 180 degrees is an obtuse angle. Therefore: 160 degrees is an obtuse angle.