Why were both capitalists and inventors needed to bring about the industrial revolution

Capitalists created the economic force that drove the revolution while the inventors created new technology that made it it easier to create products and make more money which in turn helped the capitalists

Democracy and darwinism would be my answer.

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