Sagot :

Bonjour,

bouche :

cône:

9+9 = 18

1/2 cercle: pir

3,14 * 3 =9,42

total:

18+9,42 = 27,42

=> 27,4cm

accessoires:

formule:

2pir

2pir = 20

r = 20/2pi

r = 20 / (2*3,14)

r = 20/6,28

r = 3,18

=> 3,2 cm