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diketahui :
r = 21 cm
t = 50 cm
maka :
V = 3,14 x 21² x 50
= 3,14 x 441 x 50
= 69237 cm²
jadi volumenya = 69237 cm²
=22/7×21cm×21cm×50cm
=66cm×21cm×50cm
=1.386cm×50cm
=69.300cm3