Find the measure of the angle formed between the base of the cone and a line segment that represents the slant height

How is working backward similar to solving an equation?

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10