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18. If a polygon has n sides, then it has n-2 triangles.There are 18 triangles in a 20 sided polygon.
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It has 18 sides
There is no such polygon but if you meant exterior angles of 20 degrees then it will have 360/20 = 18 sides
The sum of the exterior angles of any polygon is 360 degrees. If each angle is 20 degrees, there must be 360/20 = 18 such angles. 18 angles means 18 sides so it is an 18-sided polygon.