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15² = 17² - (10 - r₂)²
-(10 + r₂)² = 289 - 225
= 64
- (10 - r₂) = √64
-10 + r₂ = 8
r₂ = 8 + 10
r₂ = 18 cm
Jadi, jari-jari lingkaran lain = 18 cm