[tex]l \: p \: bola = \pi \times {d}^{2} \\ = 3.14 \times {40}^{2} \\ = 3.14 \times 1600 \\ = 5024 \: {cm}^{2} [/tex]
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[tex]l \: p \: bola = \pi \times {d}^{2} \\ = 3.14 \times {40}^{2} \\ = 3.14 \times 1600 \\ = 5024 \: {cm}^{2} [/tex]