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    NationalMediumGeometry7–9

    What is the area of a circle with radius 77 cm? (Use π≈227\pi \approx \frac{22}{7})

    Qual é a área de um círculo de raio 77 cm? (Usa π≈227\pi \approx \frac{22}{7})

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    Solution

    A=πr2=227×72=227×49=22×7=154 cm2A = \pi r^{2} = \frac{22}{7} \times 7^{2} = \frac{22}{7} \times 49 = 22 \times 7 = 154 \text{ cm}^{2}