[tex]luas \: lingkaran \: = \pi {r}^{2} \\ = 3.14 \times {2}^{2} \\ = 3.14 \times 4 \\ = 12.56 \: {m}^{2} [/tex]
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[tex]luas \: lingkaran \: = \pi {r}^{2} \\ = 3.14 \times {2}^{2} \\ = 3.14 \times 4 \\ = 12.56 \: {m}^{2} [/tex]