Question

Radius of gyration of a body about an axis at a distance $6cm$ from its centre of mass is $10cm.$ Find its
radius of gyration (in cm) about a parallel axis through its centre of mass.

Answer 1

$I_r=I_c+m{r}^2$
$m{K}_r^2=m{K}_c^2+m{r}^2$
$\therefore K_c=\sqrt{K_r^2-r^2}=\sqrt{(10{)}^2-(6{)}^2}$
$=8cm$