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P = 13 cm
GL = 12 CM
r = 7 CM
MAKA :
(R-r)² = P² - D²
(7-r)² = 13² - 12²
(7-r)² = 169-144
(7-r) = √25
7-r = 5
r = 7-5
r = 2 cm
jdi pnjang jari2 lain= 2 cm