Luas permukaan tabung
[tex]\pi \times d(r + t) \\ \frac{22}{7} \times 14(7 + 21) \\ 44(28) \\ 1.232 \: {cm}^{2} \: (c)[/tex]
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Luas permukaan tabung
[tex]\pi \times d(r + t) \\ \frac{22}{7} \times 14(7 + 21) \\ 44(28) \\ 1.232 \: {cm}^{2} \: (c)[/tex]