If you follow these simple steps, you'll arrive at your answer.The area of a polygon is calculated as thus; A = ½(nbh)Where A represent the area represents the number of sides represents the length of the base represent the height of the polygon.
Take for instance, the polygon is a regular pentagon. This means n = 5. Also assume that the base and the height are 5cm and 7cm respectively.This means that Area = ½ * (5 * 5 * 7) Area = ½ * 175Area = 87.5cm² Hence, the area of the polygon is 87.5cm²