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GL = 24 cm
R = 22 cm
r = 4 cm
maka :
P² = GL² + (R-r)²
P² = 24² + (22-4)²
P² = 576 + 324
P = √900
P = 30 cm
jadi jarak titikpusatnya adalah 30 cm
r = 4
pl = 24
ab?
pl = akar ab^2 - (R-r)^2
24 = akar ab^2 - (22-4)^2
24^2 = ab^2 - 18^2
576 = ab^2 - 324
576 + 324 = ab^2
900 = ab^2
akar 900 = ab
30 = ab