Tolong saia menjawab soal

[tex]luas \: selimut = \\ \pi \times d \times \: t \\ \frac{22}{7} \times 14 \times 20 \\ 44 \times 20 = 880 {cm}^{2} \\ \\ luas \: permukaan \\ 2\pi \times {r}^{2} \times \: t \\ 2 \times \frac{22}{7} \times 7 \times 7 \times 20 \\ 308 \times 20 = 7160 {cm}^{2} [/tex]