Once you've got all four endpoints tangent (either to the circle, or to the line, as is appropriate) then the next questions is are you defining/controlling the exact points of contact?
I made you this video just to demonstrate three options.
1. Controlling/defining the total width of the arcs along the wall, and making the arcs symmetrical around a horizontal construction line, or just making them equal to each other.
2. Controlling/defining the arcs' radius directly (with a dimension on one and making them equal to each other).
3. Using a vertical construction line to provide endpoints which the arcs can be made coincident to, and controlling/defining the distance between that construction line and the wall.
There are other ways you might think of. Just depends what aspect you want to control/define. Towards the end, you can see I set up option #3 above, and made the dimension 1/2 of the circle's diameter. In this way, the arcs will always adjust along with changes to the circle dimension.
Video:
https://knowledge.autodesk.com/community/screencast/43c01cd0-5bcf-45e4-bd1e-96c2b6df1aee
There are other ways too. You could dimension the distance between the arc endpoints along the straight line, for example (would also require making the arcs equal, or making them symmetrical around a horizontal construction line). You might do it this way if you wanted to control for a certain total width instead of an actual arc radius or whatever.
