The formulas for a polygon depend on the particular figure. A polygon can be a rectangle, triangle, pentagon, or many other plane figures. So, the formulas for area and volume will be different depending on the type of polygon you have.
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The formula to find the sum of interior angles of a polygon is 180° × (n - 2), where n is the number of sides of the polygon.
Any irregular polygon does not have equal sides and equal interior angles
(number of sides-2)*180 = sum of interior angles of a polygon
Use the formula of: 0.5*(n2-3n) whereby n is the number of sides of the polygon
Area of regular polygon: 0.5*apothem*perimeter