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R = 3k
r = 2k
Maka, berlaku:
d² = s² - (R + r)²
24² = 26² - (R + r)²
576 = 676 - (R + r)²
(R + r)² = 676 - 576
(R + r)² = 100
R + r = 10
Sehingga:
3k + 2k = 10
5k = 10 → k = 2
Dengan jari-jari lingkaran besarnya adalah:
R = 3k
R = 3(2)
R = 6 cm [C]