Answer:
17. angle DAB=118º
18. angle DAB=126º
Step-by-step explanation:
The angle A should be 180º-85º-33º(cause the total angle in a triangle is 180º)
So you will get 62º as the angle of A.
And what the question ask is angle of DAB，so again 180º-62º=118º(A straight line is 180º)
Same goes to question 18，use 180º to minus the two angle given，you get 54º ，and then 180ºminus 54º again，the answer is 126º
