Luas juring
[tex] \frac{ \alpha }{360} \times \pi \times r \times r \\ \\ \frac{20}{360} \times 3,14 \times 9 \: cm \times 9 \: cm \\ \\ 14,13 \: {cm}^{2} \: (b)[/tex]
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Luas juring
[tex] \frac{ \alpha }{360} \times \pi \times r \times r \\ \\ \frac{20}{360} \times 3,14 \times 9 \: cm \times 9 \: cm \\ \\ 14,13 \: {cm}^{2} \: (b)[/tex]