Tolong y........ aku kesulitan.....

10. Luas Permukaan Tabung = 2 × π × r × ( t + r )
= 2 × 3.14 × 30 × ( 30 + 30 )
= 2 × 3.14 × 30 × 60
= 2 × 3.14 × 1.800
= 6.28 × 1.800
= 11.304 cm²

Maaf cuma No 10 ya No 9 Aku Bingung
Semoga Membantu :)