volume dan luas permukaan tabung

r = ½d = ½×40 = 20cm

V = πr²t
V = 3,14 × 20² × 55
V = 3,14 × 400 × 55
V = 69080cm³

Lp = 2πr x (t+r)
Lp = 2 × 3,14 × 20 × (55+20)
Lp = 125.6 × (75)
Lp = 9420cm²

Maaf kalo salah '-
Semoga membantu :)