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r = 2cm = 0,2dm
16cm = 1,6dm
2l = 2dm³
Ob = 0,04π × 1,6
Ob = 0,064πdm³
0,064×3,14:2 ≈ 0,1
2:0,1 = 20
Odp: Możemy napełnić 20 szklanek