Triakontagono

Aldearen luzera ${\displaystyle a}$ bada:

• Azalera: ${\displaystyle A={\frac {15}{2}}a^{2}\cot {\frac {\pi }{30}}\simeq 71.3577a^{2}}$
• Perimetroa: ${\displaystyle P=30a\,\!}$
• Barne-angelua: ${\displaystyle {\frac {5040^{\circ }}{30}}\ =168^{\circ }}$

• (Ingelesez) Weisstein, Eric W.: "Triacontagon" MathWorld-en.