It has 40 sides 180-171=9 360/9=40
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If they are both regular polygons then it is the octagon which is 135 degrees whereas the hexagon is 120 degrees
If one interior angle is 165 degrees, find the number of sides of the polygon.
Any number of sides of 5 and above because all interior angles of regular polygons in this category will have obtuse interior angles.
If it is a regular polygon and each interior angle is 176 degrees then it will have 90 sides.
A concave polygon is a polygon with at least one interior angle greater than 180 degrees. This causes the polygon to have at least one "dent" or indentation in its shape. The presence of these interior angles greater than 180 degrees distinguishes concave polygons from convex polygons, which have all interior angles less than 180 degrees.