Respostas

2014-06-12T00:14:29-03:00
C = 2pi*R
= 6,28* 4,5= 28,26 cm de comprimento
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2014-06-12T00:15:33-03:00
C=2πr

C=2.3,14.4,5
C=6,28.4,5
C=28,26cm