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If it is a regular polygon then it will have 10 sides
A regular polygon with interior angles of 144 degrees has 10 sides. Using the fact that a regular n-gon has interior angles of degree (n-2)*180/n, you can solve for the number of sides fairly easily.
It will have 10 sides and it is a decagon
7 sides, which makes it a heptagon. A polygon is any shape with 3 or more sides.
Since the amount of sides of a polygon is equal to the amount of angles, we have:144x = total anglesThe total measure of each angle is determined by 180(x - 2), by splitting it into several triangles. Thus:144x = 180(x - 2)144x = 180x - 360360 = 36xx = 10This polygon has 10 sides (a decagon).