Question

find the area of circle with circumference 440 metre

Answer 1

$2\pi \: r \: = 440 \\ r = 440 \times 7 \div 2 \times 22 \\ r = 70m \\ \pi \: r {}^{2} = 22 \div 7 \times 70 \times 70 \\ area = 22 \times 700 \\ area \: = 15400m {}^{2}$
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