Luas selimut bola + tabung
[tex]2 \times \pi \times r \times t \\ 2 \times \frac{22}{7} \times \frac{21}{2} \times 33 \\ 2.178 \: {cm}^{2} [/tex]
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Luas selimut bola + tabung
[tex]2 \times \pi \times r \times t \\ 2 \times \frac{22}{7} \times \frac{21}{2} \times 33 \\ 2.178 \: {cm}^{2} [/tex]