Question

Area of circle is given below find their diameters.
$394.24sqcm$

Answer 1

Area of a circle$\pi r^2$

$\Rightarrow \pi r^2=394.24$sq.cm

$\Rightarrow \frac{22}{7}\times r^2=394.24$sq.cm

$\Rightarrow r^2=394.24\times \frac{7}{22}=56$cm

$\Rightarrow r=\sqrt{125.44‬}=11.2‬$cm.

$\therefore$ Diameter$=2r=2\times 11.2‬=22.4‬$cm.