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With a circle use the formula Pi x D, where Pi is a constant and D is the diameter. With polygons it is the sum of the length of the sides

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9y ago
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14y ago

Measre the length of all the sides and add them together. For some shapes, there are formulae to simplify this process but the formula depends on the shape.

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9y ago

Measure the length of each side or the curves that make up the boundaries of the shape and add these lengths together.

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Q: How do you work out the perimeter?
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