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l-obwód mnijszego koła
/L=l+0,6
\320l=240L
/L=l+0,6
\320l=240(l+0,6)
/L=l+0,6
\320l=240l+144
/L=l+0,6
\80l=144
l=1,8m<------
L=1,8+0,6
L=2,4m<-----