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785 = 3,14 x r² x 10
r² = 785 : 3,14 x 10
r² = 785 : 31,4
r² = 25
r = √25
r = 5
Luas Tabung = 2 x π x r (r + t)
= 2 x 3,14 x 5 (5+10)
= 6,28 x 5 x 15
= 31,4 x 15
= 471 cm²
Jadi, luas tabung tersebut adalah 471 cm²