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If you mean the following:-

Circumference of circle: 2*pi*radius

Area of circle: pi*radius^2

The above formulas are only approximates because the exact value of pi has never been finally determined because pi is an irrational number.

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Q: Is there any geometrical proof for formulas C2Pir APir2 Ps i am not asking for deriving those formulas i am asking for geometric proofs for results calculated by those formulas.?
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