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GL = 15 cm
P = 17 cm
R = 10 cm
r ?
maka :
(R-r)² = P² - GL²
(10-r)² = 17² - 15²
(10-r)² = 289 - 225
10-r = √64
10-r = 8
r = 10 - 8
r = 2 cm
(10-r)² = 17² - 15²
(10-r)² = 289 - 225
10-r = √64
10-r = 8
r = 10 - 8 = 2 cm