Question

Find the diameter of a circle whose circumference is $63.8m$.

Answer 1

Circumference of the given circle $=63.8m$
Let the radius of the given circle be $r$.
$\Rightarrow$ Circumference of the circle $=2\pi r$

$\Rightarrow 2\pi r=63.8m$

$\Rightarrow 2\times \frac{22}{7}\times r=63.8m$

$\Rightarrow 2r=\frac{7}{22}\times 63.8m$

$\Rightarrow 2r=\frac{7}{1}\times 2.9m$

$\Rightarrow 2r=7\times 2.9m$

$\Rightarrow d=20.3m$ [Since, diameter $d=2r$]

Therefore, the diameter of the given circle $=20.3m$.