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L
70=2.385
L
L=770
70
L=11
V=πr²t
t=V÷πr²
t=385÷(22/7× 7×7)
t=385÷154
t=2,5 dm
Luas sisi tangki
=2πr(r+t)
=2×22/7×7(7+2,5)
=44(9,5)
=418 dm²
=41800 cm²