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V=πr²t
r²=V÷(πt)
r²=785÷(3,14.10)
r²=785÷31,4
r²=25
r=√25
r=5 cm
Luas tabung
=2πr(r+t)
=2.3,14.5(5+10)
=31,4(15)
=471 cm²