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R = 3
r = 2
D = 12 cm
maka :
P² = D² + (R+r)²
P² = 12² + (3+2)²
P² = 144 + 25
P = √169
P = 13 CM
jadi jarak k 2 titik pusat = 13 cm
12² = s² - 5²
s = √144 + 25
= √169
= 13 cm