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R = 7 cm
r = 5 cm
D = 16 cm
dit : P ?
maka :
P² = D²+(7+5)²
P² = 16² + 12²
P² = 256+144
P = √400
P = 20 cm
jadi jarak titik pusat = 20 cm
s² = 16² + 12²
s² = 256 + 144
s² = 400
s = 20 cm