tolong bangett, pake cara ya
[tex]luas \: \frac{1}{2} \: lingkaran = \frac{1}{2} \times \frac{1}{4} \times \pi \times {d}^{2} = \frac{1}{2} \times \frac{1}{4} \times \frac{22}{7} \times 14 \: cm \times 14 \: cm = 77 \: {cm}^{2} [/tex]
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