If $R$ is the radius of the circumcircle of the $\Delta ABC$ and $\Delta$ is its area,then
- A$R = \frac{a + b + c}{\Delta}$
- B$R = \frac{a + b + c}{4\Delta}$
- C$R = \frac{abc}{4\Delta}$
- D$R = \frac{abc}{\Delta}$
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