Răspuns:
G=9 cm, d= 10 cm
a) At=Al+Ab
Al=piRG
R=d : 2=> R= 10:2=>R=5 cm
Al=pi x 5 x 9= 45pi cm^2
Ab=pi x R^2=> Ab=pi x 5^2=> Ab=25pi cm^2
At= 45pi+25pi=70pi cm^2
b) V=piR^2h/3
h^2=G^2-R^2=> h^2=9^2-5^2=>h^2=81-25=>h^2=56=>h=2rad14
V=pi x 5^2 x 2rad14/3=pi x 25 x 2rad14=50rad14pi/3 cm^3
