a
\(x=\sqrt{a^{2}-\frac{a^{2}}{4}}=\sqrt{\frac{3 a^{2}}{4}}=\sqrt{\frac{3 a^{2}}{4}}=\frac{\sqrt{3}}{2} a\)

\(\mathrm{A}_{1}=\frac{1}{2} \times \mathrm{a} \times \frac{\sqrt{3}}{2} \mathrm{a}\)

\(\mathrm{A}_{1}=\frac{\sqrt{3}}{4} \mathrm{a}^{2}\)

\(\mu_{1}=\mathrm{N}_{1} \mathrm{IA}_{1}\)

\(\mu_{1}=\frac{4 \mathrm{I} \sqrt{3}}{4} \mathrm{a}^{2}\)

\(\mu_{1}=\sqrt{3} \mathrm{I} a^{2}\)

\(A_{2}=a^{2}\)

\(\mu_{2}=N_{2} I A_{2}\)

\(=3 \times I \times a^{2}\)

\(\mu_{2}=3 \mathrm{Ia}^{2}\)