To find the area, use formulas to find the area of the smaller, regular shapes. Then add up all the smaller areas to find the area of the original shape.
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The area of a figure made up of two or more shapes
Partition it into simple shapes and work out their areas. Then add together all the components.
You cut the shape down into smaller shapes that you recognise and know how to calculate the area of. Then calculate the area of the small shapes and add the all up.
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
There is no one formula for surface area for all shapes. Basically, it is the sum of all the faces and laterals.