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π≈22/7
O=πd
O=5*22/7 dm =110/7 dm =11/7 m obwód koła
2km=2000m
2000m :11/7 m=2000*7/11 =1272,(72)
1272 pełnych obrotów
D=5dm
r=2,5dm
L=2PIr
L=2*22/7*2 1/2 = 44/7 * 2 1/2= 44/7 * 3/2 = 66/7=~9,43 dm
20000 : 9,43 = ~2120
No w zaokrągleniu to 2121, ALE pełnych wychodzi 2120