volume tabung 1.570 cm³. jika jari jari tabung 10 cm. nilai π= 3,14 maka luas sisi tabung adalah

V = phi × r^2 × t

1.570 = 3,14 × 10^2 × t

1.570 = 3,14 × 100 × t

1.570 = 314 × t

t = 1.570 ÷ 314

t = 5 cm



jdi luasnya

L = 2 × phi × r × (r + t)

= 2 × 3,14 × 10 × (10 + 5)

= 2 × 3,14 × 10 × 15

= 6,28 × 150

= 942 cm