Calculus
12π\(\displaystyle\) \(\frac{12}{\pi}\)
6π\(\displaystyle\) \(\frac{6}{\pi}\)
33π\(\displaystyle\) \(\frac{3\sqrt{3}\)}{\(\pi\)}
63π\(\displaystyle\) \(\frac{6\sqrt{3}\)}{\(\pi\)}