Question

the area of a circle is 154 metre square find its circumference

Answer 1

area =154
πr^2=154
r^2=49
r= 7
circumference of circle=2πr
2×22/7×7
44cm
44 is the answer

Answer 2

let the radius of the circle be r

we know that area of a circle is given by the formula
$\pi \times {r}^{2}$
putting
$\pi = \frac{22}{7}$
we get

$\frac{22}{7} \times {r}^{2} = 154$
${r }^{2} = 49$
$r = 7 \: m$
now putting r in the formula for circumference
$cicumference = 2\pi \times r = 2 \times \frac{22}{7} \times 7 = 44 \: m$