Jawabanmu

2014-08-31T10:52:55+07:00
L. selimut = 2πrt
7536 = 2 x 3,14 x r x 40
=> 7536 : 3,14 = 2 x 40 x r  => 2400 = 80 x r => 2400 : 80 =  r
30 = r
V = π r² t
   = 3,14 x ( 30 )² x 40
   =3,14 x 900 x 40
  = 113.040 cm³
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