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pakai triple pythagoras = 15, 17 , 8cm
jari jari yg lain = 4 cm
d² = s² - (r₁+r₂)²
15² = 17² - (4+r₂)²
(4+r₂)² = 17²-15²
(4+r₂)² = 289 - 225
(4+r₂)² = 64
4+r₂ = √64
4+r₂ = 8
r₂ = 8 - 4
Sehingga,
r₂ = 4 cm