In the beginning activity for this section and in Exercises 1.21 and 1.22, we saw that we could relate the coordinates of the terminal point of an arc of length greater than π2 on the ...In the beginning activity for this section and in Exercises 1.21 and 1.22, we saw that we could relate the coordinates of the terminal point of an arc of length greater than π2 on the unit circle to the coordinates of the terminal point of an arc of length between 0 and π2 on the unit circle.