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4400 = 2 x 22/7 x 35 x t
t = 20 cm
Luas selimut tabung tanpa tutup = 2πrt + πr²
= πr(2t + r)
= 22/7 x 35 (40 + 35)
= 110(75)
= 8250 cm²
L = πr² + Luas selimut
L = 22/7 * (35)² + 4400
L = 3850 + 4400
L = 8250 cm²