3. You’d take half of 98 and the answer would be 49
4. You would subtract 100 from 180 and multiply the 80 by 2 to get 160
5. You would divide 38.5 by 2 and get 9.25. Take that and subtract by 180 and get 160.75 (I’m iffy on this one)
6. 90 degrees since the diameter is perpendicular to the line