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Verified answer

Bonjour,

V cylindre : pi*20²*40 = 16000pi(cm^3) ≈502540cm^3 soit 0,05024m^3

V demi-boule = [4/3(pi*20^3)]/2 = 5333pi(cm^3) ≈16743cm^3 soit0,016743m^3

V 1 plot = 0,05024+0,016743 = 0,066983 soit 0,067m^3

V 1000plots = 0,067*1000 =

 
exo 2 :

1a) V cylindre = pi*1,5²*6 = 13,5pi(cm^3)

  b) V1 = [1/3(1,5²*3)]*2
           = 4,5pi(cm^3)

  c) 4,5pi/13,5pi = 45pi/135pi = 45/135 = 1/3

2) 240cm^3          12cm^3
     60min                3min