What does the set of points on any line correspond to?

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

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.