You get the area by using formulas. There is usually a specific formula to find the area of each shape. Some irregular shaps may not have a formula.
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Not easily. You need to find the area or perimeter of the components and sum them.
Break the composite shape down into simple units. Find the perimeter and area of each and then add these up as appropriate. If the shape cannot be broken down easily you may have to rely on integration or numerical methods.
area of a polygon is the amount of area inside the polygon. A square is a polygon and its area is the side length squared, ie times itself. Some polygons are harder to find the area of.
Multiply the sides
you find the perimeter and then you times all the sides together