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d = 12 cm
p = 13 cm
r = 3 cm
Ditanyakan: R = ?
Jawab:
d = √(p² - (R - r)²)
atau
d²= p² - (R - r)²
12² = 13² - (R - 3)²
144 = 169 - (R - 3)²
(R - 3)² = 169 - 144
(R - 3)² = 25
(R - 3) = √25
(R - 3) = 5
R = 5 + 3
R = 8
Jadi, panjang jari-jari yang lainnya adalah 8 cm.
Semangat belajar.. ^_^