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R = 29 cm
r = 14 cm
GL = 36 cm
maka :
P² = GL² + (R-r)²
P² = 36² + (29-14)²
P² = 1.296 + 225
P = √1.521
P = 39 cm
jadi jarak titik pusat = 39 cm
36² = p² - (29-14)²
1296 = p² - 15²
1296 = p² - 225
p² = 1296+225
p² = 1521
p = √1521
p = 39 cm