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Π=22/7
jari jari :diameter÷2
(21 ÷2)
=10,5
luas:10,5 × 22/7 =33
22.volume tabung :luas alas × tinggi tabung
luas alas=Π×jari jari
=Π=28:2=14
14 × 22/7 =44
volume tabung =44×32=1408cm
maaf kalau salah