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area = pi*radius2

Remember, to half the diameter to get the radius.

Get the area of the outside circle, and the area of the inside circle, then take the inside area from the outside.

I think it would be more helpful to you not to give you the answer. Work it out from this. If you are wondering what pi is, it is 3.14159

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Q: How do you work out the area between to circles one has a diameter of 3.5m and the other inside it is 3.1m?
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