Which of the following was not an issue in the presidential election of 1960?
a. defense spending
b. kennedy's religion
c. international affairs
d. nixon's religion

D. Nixon's religion
Nobody cared about Nixon's religion, but they did care about Kennedy's. John Kennedy was a Roman Catholic and there had never been a Catholic in the presidency, so Americans worried about this fact.

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