Question

Area of a circle is 154 cm^2, find its circumference.​

Answer 1

Explanation:

$\pi {r}^{2} = area \: of \: circle \\ given \: area \: is \: 154 {cm}^{2} \\ \pi {r}^{2} = 154 \\ {r}^{2} =154 \times \frac{7}{22} (\pi = \frac{22}{7} ) \\ {r }^{2} = 49 \\ r = \sqrt{49} \\ r = 7$

so the radius of circle is 7cm

$2\pi r = circumference \: of \: circle \\ 2 \times \frac{22}{7} \times 7 \\ 44cm$

so the circumference of the circle will be 44cm