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d*kuadrat = p*kuadrat - ( R - r )*kuadrat
12kuadrat = p*kuadrat - ( 11 - 2 )*kuadrat
144 = p*kuadrat - ( 9 )*kuadrat
144 = p*kuadrat - 81
144 + 81 = p*kuadrat
225 = p*kuadrat
akar 225 = p
15 cm = p
p (jarak pusat 2 lingkaran)
= 15cm (c.)