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D = 24 cm
R = 5 cm
P = 25 cm
mka :
(R+r)² = P² - D²
(5+r)² = 25² - 24²
(5+r)² = 625 - 576
(5+r) = √49
5+r = 7
r = 7-5
r = 2 cm
jdi pnjang jari2 yg lainnya = 2 cm