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t=14 cm
V=πr²t
r²=V:πt
r²=2156: (22/7 × 14)
r²=2156:44
r=√49
r=7 cm
Luas permukaan tangki
=2πr(r+t)
=2×22/7×7(7+14)
=44(21)
=924 cm²