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volume tabung = luas alas × tinggi
v = πr^2. t
v = π(21/2)^2.21
volume bola
v = 4/3.π r^3
v = 4/3.π (21/2)^3
volume tabung - volume bola adalah volume tabung di luar bola.
= π(21/2)^2.21 - 4/3.π (21/2)^3
= π(21/2)^2.21 - 4/3π(21/2)^2.21/2
= 21(21/2)^2π - 14(21/2)^2π
= 7.(21/2)^2π
= 7.441/4.22/7
= 441× 11/2
= 4.851/2
= 2.425,5 cm^3