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385 = 22/7 . r^2 .10
385x7=220 x r^2
2695/220=r^2
12,25 =r^2
r=3,5
luas alas tabung = pi r^2
=22/7x3,5x3,5 =38.5
La x t = 385
La x 10 = 385
La = 385/10
La =38,5
maka luas alas tabung adalah 38,5 cm²