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= 22 x 7 x 20
=3080 cm3
1570=πr²+2π.r.20
1570=πr²+40πr
πr²+40πr-1570=0
π(r+50)(r-10)
r=10 cm
Volume tabung
=πr²t
=3,14.10².20
=314.20
=6280 cm³