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R = 8 cm
r = 3 cm
GL = 12 cm
dit : P ?
maka :
P² = D² + (R-r)²
P² = 12² + (8-3)²
P² = 144 + 25
P = √169
P = 13 CM
jadi jarak titik pusat = 13 cm
144 = √x² - 5²
144 = √x² -25
144+25 = x²
169 = x²
√169 = x
13 = x
jadi jarak kedua pusat adalah 13 cm