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The answer depends on how simple of complicated the shape is. For a reasonably simple shape, break it don into shapes such as triangles, parallelograms and trapezia, and circles or ellipses. Measure the dimensions of these shapes in feet and then, using standard formulae, calculate their areas - which will be in square feet. Add the results together to get the area of the shape.

For more complicated shapes you may need to approximate the area using the above shapes to approximately match the shape.

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Q: How do you figure out square footage?
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