If AB = 5 cm, AC = 12 cm and $AB\bot AC$, then the radius of the circumcircle of $\triangle ABC$ is

If AB = 5 cm, AC = 12 cm and $AB\bot AC$, then the radius of the circumcircle of $\triangle ABC$ is
1). 6.5 cm
2). 6 cm
3). 5 cm
4). 7 cm

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