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Jarak = 17
r1 + r2 = √(17² -15²) = 8
r1 = 3 --> r2 = 8-3 = 5
R + 3 = √ 289 - 225
R + 3 = √ 64
R + 3 = 8
R = 8 - 3
R = 5 cm