It depends on the shape, whether it gives you the dimensions or not, or whether you can divide it up into separate shapes.
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You need to break down the composite figure into simpler shapes whose areas you can calculate using appropriate formule and then add together the areas of all the individual bits.
Composite shapes are figures formed by combining two or more simple geometric shapes, such as rectangles, triangles, circles, or polygons. They can be analyzed in terms of their individual components to calculate area, perimeter, or volume. Understanding composite shapes is essential in geometry, as it allows for more complex designs and problem-solving. Examples include shapes like a house made of a rectangle and a triangle or a circular pool surrounded by a rectangular deck.
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.
Calculate the area of the shape. The formula to be used will be different for different shapes.
You measure or calculate the area. How you do that will depend on the shapes involved.