Answer :

[tex]C=\pi d\\ d=\dfrac{C}{\pi}[/tex]
[tex]C=\pi d\\ \\ C\cdot \frac { 1 }{ \pi } =\pi \cdot \frac { 1 }{ \pi } \cdot d\\ \\ \therefore \quad d=\frac { C }{ \pi } [/tex]

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