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Verified answer
D = 28 cmr = 1/2 x 28 = 14 cm
Luas permukaan tabung = 2πr (r + t)
L = 2 . 22/7 . 14 (14 + 40)
L = 2 . 22 . 2 (54)
L = 2 x 22 x 2 x 54
L = 4.752 cm²
Verified answer
Dik t=40 cm ,d=28cm sehingga r=1/2d=1/2×28cm=14 cmLp=2vr(r+t)
=2×22/7×14(14+40)
=88×54=4.752
jadi luas permukaan tabung adalah 4.752