## Essential University Physics: Volume 1 (3rd Edition)

We know that (a) The distance from the center of the vertices is given as: $d=\frac{1}{\sqrt{3}}$ We know that the rotational inertia is given as $I=3(md^2)=3(m(\frac{L}{\sqrt{3}})^2)=mL^2$ (b) We know that $I=2m(\frac{L}{2})^2=(\frac{1}{2})mL^2$