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D = 28 CM
P = 35 cm
R = 8 cm
maka :
(R+r)² = P² - D ²
(8+r)² = 35² - 28²
(8+r)² = 1.225 - 784
8+r = √441
8+r = 21
r = 21 - 8
r = 13 cm
jadi panjang jari2 y lain = 13 cm
784 = 1225 - ( 8+r)²
(8+r)² = 441
8 + r = √441
8 + r = 21
r = 13 cm