In \( \triangle ABC \), the lengths of sides \( AC \) and \( AB \) are \( 12 \, \text{cm} \) and \( 5 \, \text{cm} \), respectively. If the area of \( \triangle ABC \) is \( 30 \, \text{cm}^{2} \) and \( R \) and \( r \) are respectively the radii of circumcircle and incircle of \( \triangle ABC \), then the value of \( 2R+r \) (in \( \text{cm} \)) is equal to ____________.
