Question

Find the area of a circular sheet whose circumference is 154m

Answer 1

$2\pi \: r = 154$
$r = (154 \times 7) \: 22 \times2$
$r = 49 \: by \: 2$
$ar = \pi\:r {}^{2}$
$(22 \times 49 \times 49) \: by \: 7 \times 2 \times 2$
$3773 \: by \: 2$
$1886.5m {}^{2}$

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Answer 2

circumference = 154 m

2πr = 154

r = 154/2π

r = 77/π

Area = πr²

        = π (77/π)²

        =77 *77 π/π²

        =49 * 121/π

        =49 * 121 * 7/22

        = 1886.5 m²