Respostas

2014-03-11T21:22:34-03:00
C = 2.π.r
C = 2. 3,14 . 8
C = 50,24 cm
1 5 1
2014-03-11T21:23:21-03:00
2π.r 
2*(3,14)*8= 
6,28*8= 
50,24cm