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V=[tex] \pi [/tex]×r²×t
6930=22/7×r²×5
441=r²
21 dm=r

Tabung

V = 6930 dm³
t = 5 dm

Jari-jari (r) tabung
r = √(V/(πt))
r = √(6930 /((22/7) × 5))
r = √441
r = 21 dm