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38,5 = 22/7 .r^2
r^2 = 38,5 x 7/22
r^2 = 12,25
r = V12,25
r = 3,5
Luas alas tabung = Luas lingkaran
Luas alas tabung = pi . r²
38,5 cm² = 3.14 . r²
r² = 38,5 cm²
3,14
r² = 12,26 cm²
r = √12,26 cm²
r = 35 cm