Obtuse angles.
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If this 9 sided polygon is a regular polygon, then the sum of its angles is:(n - 2)180 degrees = (9 - 2)180 degrees = 7 x 180 degrees = 1,260 degrees.
Its 9 because 360 divided by 40 = 9
The internal angles of a regular nonagon (a polygon having 9 sides) are obtuse angles of 140o.
The exterior angles of any polygon add up to 360. They are 9 degrees each.
All exterior angles of any polygon sum to 360 deg. If there are 9 angles then each angle is 40 degrees.