Keliling lingkaran = 2 x π x r
[tex]22 = 2 \times \frac{22}{7} \times r \\ 22 = \frac{44}{7} \times r \\ 22 \times \frac{7}{44} = r \\ r = 3,5 \\ \\ luas \: sisi \: tabung \\ 2 \times \pi \times r(r + t) \\ 2 \times \frac{22}{7} \times 3,5(3,5 + 9) \\ 22(12,5) \\ 275 \: {cm}^{2} \: (d)[/tex]
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Keliling lingkaran = 2 x π x r
[tex]22 = 2 \times \frac{22}{7} \times r \\ 22 = \frac{44}{7} \times r \\ 22 \times \frac{7}{44} = r \\ r = 3,5 \\ \\ luas \: sisi \: tabung \\ 2 \times \pi \times r(r + t) \\ 2 \times \frac{22}{7} \times 3,5(3,5 + 9) \\ 22(12,5) \\ 275 \: {cm}^{2} \: (d)[/tex]