Find the missing side length.

To find the missing side length of a figure that resembles an upside-down "b", we need to analyze it further. Given the lengths of 9 yd, 7 yd, 5 yd, 4 yd, and 15 yd, it is important to note that these dimensions suggest that the shape has vertical and horizontal segments forming right angles.

If we assume that the shape is composed of two rectangles (the vertical part of the "b" and its rounder top), then we can use the lengths given to figure out the missing side.

However, to find a specific missing side, we need to know which side is missing or how the sides are arranged. Since we have more sides than common in a typical "b" shape, I will need to make some assumptions.

Let's assume the longer vertical side (15 yd) includes the length of the "b's" rounded section. The shapes would look like:

1. Start from the bottom.
2. Move up 9 yd vertically.
3. Move right 7 yd.
4. Move down 5 yd vertically to meet another horizontal segment.
5. Then, from the bottom of this segment, you go right 4 yd, which could possibly be at the same level as the top segment.
6. Finally, the bottom must go back down.

Given this arrangement, if we try calculating the potential vertical and horizontal lengths, let’s assume the 15 yd is correct.

Using simple geometry and the properties of rectangles with right angles, we focus on completing the shape vertically and horizontally to balance the overall figure. Depending on the dihedral arrangements, the correct length could be calculated from either existing lengths directly opposite or through some form of triangulation but rooted in given dimensions.

Since you haven't specified which side you're missing, could you please clarify either an arrangement or a reference to which number corresponds to which part? For instance, are you missing the horizontal part or vertical, or a rounded segment?

However, without loss of generality, if we take the sorted measures corresponding with left part, right part, and base we can conclude, if the figure recognizes a standard area approach:

15 yd (total vertical) - 9 yd (vertical) - 7 yd (horizontal) as they should form together give:

\[ \text{Missing length} = (Vertical total =15 yd) - (Vertical = 9 yd + base reach = 7 yd )\]

Thus potentially simplifying to allow each mistake base to be easily accounted for.

Could you specify which side is the missing one according to your diagram, or simply confirm, as that will help in deriving a precise understanding in relativity toward a holistic shape assembly.