L permukaan tabung = 2πr (r+t)
= 2 x 22/7 x 3,5 (3, 5+15)
= 22 x 18,5 = 407 cm²
L permukaan tabung = 2 phi x r x r + 2 phi x r x t = 2 x 22/7 x 3,5 x 3,5 + 2 x 22/7 x 3,5 x 15 = 77 + 330 = 407 cm
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L permukaan tabung = 2πr (r+t)
= 2 x 22/7 x 3,5 (3, 5+15)
= 22 x 18,5 = 407 cm²
L permukaan tabung = 2 phi x r x r + 2 phi x r x t = 2 x 22/7 x 3,5 x 3,5 + 2 x 22/7 x 3,5 x 15 = 77 + 330 = 407 cm