As much as i understand your requirement that you want to show line in drawing.
For this you have to show sketch in drawing.
In drawing go to view and click on sketches.
This will show the sketch in drawing.
Welcome to the forum.
If I understand you correctly edit your sketch. It looks like you already have the bottom circle constrained to the line.
Use the convert entites and select the top arc. Change the arc to be a construction line and then constrain the other end of the line
to the arc center.
Hope this helps.
If you hover the cursor over the edge of the arc, a small icon will appear at it's centre. You will then be able to select that icon.