Réponses

2014-02-08T14:14:34+01:00
La circonférences correspond à 2 π R donc R = C/ 2 π
                                                                    R = 56 /  2 *3.14
                                                                    R = 8.9  cm

donc volume ballon   V = 4 /3 x π  x R³
                                   V = 4/3 x 3.14 x 8.9³ 
                                    V = 2951.47 cm ³