Now I’m at my day job and don’t have access to what I need to show you how to draw this but, with the given dimensions, start with an online calculator to figure out the included angle for an arc with a 5m radius and 5m length. It happens to be 57.296°.
Use the Arc tool (not the 2-Point Arc) to draw an arc with a 5m radius and 57.296° included angle. After that you can use Offset on that arc to create the other edge of the inner board as well as the edges for the outer board. Use the Line tool to connect the ends of the arcs to create faces. then, if you want to make this 3D, Push/Pull to width. Make each bow a component. Rotate the outer one about the center of the arc (I used the origin for this) to raise the bottom up 10cm.
You can draw a block to fit between the inner and outer bow, make it a component and use Copy/Rotate to copy it around the center.
No. The inside peak of the bow will be a little more than 4.2 meters.
