Trigonometry! #158

Geometry Level 3

In \(\Delta ABC\), \(a:b:c=4:5:6\). If \[\frac{R}{r}=\frac{x}{y}\] where \(x\) and \(y\) are relatively prime integers, enter the value of \(x+y\).

This problem is part of the set Trigonometry.

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