Circumference = 2× pie × r
Circumference = 6pie
Thus ;
2pie × r = 6pie
r = 3
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[tex]r = \frac{1}{2} \sqrt{ ({ - 6})^{2} + {2}^{2} - c} \\ [/tex]
[tex]3 = \frac{1}{2} \sqrt{ 36 + 4 - c} \\ [/tex]
[tex]6 = \sqrt{40 - c} [/tex]
[tex]( {6})^{2} = ({ \sqrt{40 - c} })^{2} [/tex]
[tex]36 = 40 - c[/tex]
[tex]c = 4[/tex]
