Question

Find the area of a circle. If its circumference is 14cm

Answer 1

circumference of circle is 14 centimetre

$circumference = 2\pi \: r \\ = 2 (\frac {22}{7} )(r) = 14 \\ = \frac{44}{7} r = 14 \\ = r = 14( \frac{7}{44} ) \\ = r = 2.23$

$area = \pi \: {r}^{2} \\ = > \frac{22}{7} (2.23)^{2} \\ = > 15.62cm^{2}$

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