You would need a measure of each side, and the total perimeter (all sides).
Dividing the perimeter by the length of one side gives the number of sides.
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The polygon is a Quadrilateral.
40 sides
If its a regular polygon then 180-interior angle and divide the answer into 360 which will give the number of sides of the polygon.
360/18 = 20 sides
To find the number of sides of a regular polygon, you can use the formula: Number of sides = 360 degrees ÷ Measure of each interior angle. In this case, if one interior angle is 108 degrees, the regular polygon has 360 ÷ 108 = 3.33 sides. Since a polygon cannot have a fractional number of sides, we round down to the nearest whole number. Therefore, the regular polygon has 3 sides, which makes it an equilateral triangle.