Respostas

2013-09-18T22:13:29-03:00
2pir

2 . 3,14 . r = 314

6,28 . r = 314

r = 314 / 6,28

r = 50 cm

1 5 1
2013-09-18T22:15:49-03:00
C = 2*\pi*r
314 = 2*3,14*r
r = 50cm

Espero ter ajudado!!!