How did the tang and song dynasties culturally differ?

The Song Dynasty practiced Buddhism whereas the Tang banned the religion and persecuted those who followed it during the later time of their ruling. The Tang Dynasty also had expanded their empire and even reformed civil service. The Tang expanded and conserved their power by establishing tributary states. They had a stronger more powerful military when compared to the Song. The Song Dynasty ruled a smaller empire during their time that primarily relied on sea power. Their military power was weaker than what the Tang Dynasty’s was.

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160