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D = 12 cm
P = 20 cm
R = 11
maka :
(R+r)² = P² - D²
(11+r)² = 20² - 12²
(11+r)² = 400 - 144
11+r = √256
11+r = 16
r = 16 - 11
r = 5 cm
jadi panjang jari2 y lain = 5 cm