Hello, can you explain how to solve this problem, please?

**Problem**

Thank you!

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Hello, can you explain how to solve this problem, please?

A circle with a diameter of 2n-1 is symmetrically drawn on a chessboard of 2nx2n cells. Through how many squares of the board does this circle pass and how many squares will fit completely inside this circle? E.g if n = 4, then answer is, completely inside: 4, pass: 12;

Thank you!

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