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38.500 = 3,14 * r^2 * 40
38.500 = 125,6 * r^2
r^2 = 38.500 / 125,6
r^2 = 306,5286
r = √306,5286
r = 17,5 cm
luas alas tabung = π * r²
luas alas tabung = 3.14 * 17,5 * 17,5
luas alas tabung = 961,625 cm^2