С=2πr, π=3
1) C=2*24*3=144
2) C=2*12*3=72
3) C=2*6*3=36
4) C=2*1,2*3=7,2
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С=2πr, π=3
1) C=2*24*3=144
2) C=2*12*3=72
3) C=2*6*3=36
4) C=2*1,2*3=7,2