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r^{2} : r^{2}
6^{2} : 9^{2}
36 : 81
4 : 9
diket : diameter bola a(6), b(9) maka r masing" bola a(3), b(4,5)
masukkan ke rumus, 4π(3)kuadrat : 4π(4,5)kuadrat
coret 4π, maka menjadi 3kuadrat : 4,5kuadrat
9 : 20,25