pls help and explain! i still can't understand how to do these type of questions . #15,16,29. these are quadrant angles and calculating angles topic

the angle in standard position whose terminal arm passes through point Q. c) Extend the terminal arm to include the point R(8, 16). Determine sin 0 for the angle in standard position whose terminal arm passes through point R. d) Explain your results from parts a), b), and c). What do you notice? Why does this happen? 15. The point P(k, 24) is 25 units from the origin. If P lies on the terminal arm of an angle, 0, in standard position, 0