Inner radius of toroid

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@PR

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I am designing a toroidal transformer.I have selected the toroid dimension based on the kVA ratings at the output. But the dimension specifies only the outer radius and the height. Is there a formula to calculate the inner radius of the toroid using the outer radius and the height? If not, how do I do it?

The link I referred to for the toroid dimensions is:
https://www.alibaba.com/product-detail/Toroidal-transformer-3KVA_759504968.html
 

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