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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.

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Q: How do you determine the area of a figure that is not a rectangular polygon?
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What is the formula for the lateral surface area of a prism?

It depends on the prism. There will be different formulae for the bases depending on type of polygon and that will also determine the number of rectangular faces.


What is the surface area of a rectangular pyramid?

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Perimeter and area are not sufficient to determine the shape of a figure.


What is the perimeter of an octagon that has an area of 43560 sq ft?

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How do you determine area if perimeter is given?

More information is required in order to answer this question. What is the shape for which the perimeter is given? If it anything other than a circle or regular polygon it is not possible to determine the area. For a circle or regular polygon, the answer will depend on the shape.


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What is the formula for a polygon?

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