Respostas

2014-05-14T09:47:25-03:00


C = 2 .  \pi . r

C = 2 . 3,14 . 7

C = 43,96

2014-05-14T09:53:57-03:00
C = 2 *  \pi * r 
 \pi = 3,14
r = 7 cm

C = 2 * 3,14 * 7

C = 6,28 * 7
C = 43,96

resposta: 43,96 cm