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1,6 = 9×10^9. 6 × 10^-6. 6 × 10^-6 : r^2
1,6 = 324.10^-3 : r^2
r^2 = 324 : 1,6 .10^-3
r^2= 202,5 . 10^-3 atau 2025 . 10-4
r=akar 2025 . 10-4
r=45.10^-2r= 0,45 m