Area you multiply 2 sides and perimeter you add all the sides together.
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Finding the perimeter of a polygon is finding how far it is in total along all the edges of the polygon; whereas finding the area of a polygon is finding how much space the polygon covers. The perimeter of a polygon forms the boundary around the area of the polygon.
Different polygons have different relationships between perimeter and area. For example, if we assume regular polygons, an equilateral triangle and a square have different perimeters for the same area. If you allow irregular polygons, the variety is even bigger.
For the perimeter of a polygon you add the sides to find the total distance around the shape. For area, you multiply using the various formulas for different polygons.
If you restrict yourself to integers, the perimeter of a four-sided polygon is 16.
Perimeter = 2*Area/Apothem.