D. Calculate the measure of the angles containing the variables a and b and explain your reasoning 17. 18. 19. 85° th -1, a 1110 65 alb 20. 21. 22. (115° 115 a 2b - 25 a b - 15 . 'b ! 23. 24. 4b 4a 2b 14a a 500 6 4a - 110°C​