[tex]a).luas \: \frac{3}{8} \: lingkaran \\ \frac{3}{8} \times \pi \times r \times r \\ \frac{3}{8} \times \frac{22}{7} \times 7 \times 7 \\ 57,75 \: {cm}^{2} \\ \\ b).luas \: diarsir \\ \frac{3}{14} \times r \times r \\ \frac{3}{14} \times 14 \times 14 \\ 42 \: {cm}^{2} [/tex]
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[tex]a).luas \: \frac{3}{8} \: lingkaran \\ \frac{3}{8} \times \pi \times r \times r \\ \frac{3}{8} \times \frac{22}{7} \times 7 \times 7 \\ 57,75 \: {cm}^{2} \\ \\ b).luas \: diarsir \\ \frac{3}{14} \times r \times r \\ \frac{3}{14} \times 14 \times 14 \\ 42 \: {cm}^{2} [/tex]