How are the romans penalties for the similar or different from the laws and penalties of the united states today?

American Law "A multitude of the world's law structures are directly derived from the ancient Roman legal codes. These, whether economic, judicial, or political, owe their modern existence to Roman attempts, however imperfect, to create an empire based on law as much as force. The United States, the United Nations, and the European Union-- all implicitly reflect the influence of Roman universalism."
Romans Law, A more violent and harsh way of penalties with so little to know about laws and rights. 

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