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volume tabung= π(phi)r²×t
1) v=22/7×3.5×3.5×70
v=2965m³(kalau satuan tingginya sama dengan jari-jari)
2)v=22/7×17/2×17/2×21
v=1589.5 cm³
3)v=3.14×4.5×4.5×30
v=1907.55 mm³