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R-r = 5
R-3 = 5
R = 8
12² = 13²-(r1-r2)²
144 = 169 - (r1-3)²
(r1-3)² = 169-144
(r1-3)² = 25
r1-3 = √25
r1-3 = 5
r1 = 5+3 = 8 cm