$a^2$a^2

$\displaystyle \frac{3\sqrt{3}}{2} \cdot a^2$\displaystyle \frac{3\sqrt{3}}{2} \cdot a^2

$\displaystyle \frac{3}{2}a^2$\displaystyle \frac{3}{2}a^2

$\displaystyle \frac{3+\sqrt{3}}{2} \cdot a^2$\displaystyle \frac{3+\sqrt{3}}{2} \cdot a^2