Who were the first people to spread christianity

Over 30 years, Paul clocked up around 10,000 miles, traveling across the Roman Empire. He preached in some of the empire’s most important cities. Although places like Ephesus, Philippi, Corinth and Athens looked magnificent, they were also home to tens of thousands of poor, desperate people who were the perfect audience for the Christian message of eternal life. 

John the Baptist was the first person to spread the word of Christianity

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