Luas 2 tembereng
[tex]2 \times \frac{57}{200} \times r \times r \\ \\ \frac{57}{100} \times 20 \times 20 \\ \\ 228 \: {cm}^{2} [/tex]
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Luas 2 tembereng
[tex]2 \times \frac{57}{200} \times r \times r \\ \\ \frac{57}{100} \times 20 \times 20 \\ \\ 228 \: {cm}^{2} [/tex]