It seems like you're asking for the length of line segment $BC$, but the full context or diagram associated with the problem isn't provided. If there's a figure or additional information, such as the dimensions or geometric relationships between points, I'd need that to calculate the correct answer.

You can upload a picture or provide more details of the problem (such as a triangle, coordinates, or specific distances). This will help in determining the length of $BC$.

Would you like to share more details or upload a diagram? Here are 5 related questions that could be relevant depending on the context:

1. Is $BC$ part of a triangle? If so, what type of triangle is it?
2. Are there any known angles or distances in the diagram?
3. Are there other line segments given that can help solve the problem?
4. Is the length of $BC$ related to the Pythagorean theorem or a trigonometric ratio?
5. Are the points $A$, $B$, and $C$ in a coordinate plane? If yes, what are their coordinates?

Tip: When solving for the length of a line segment in a triangle, always check if the triangle is right-angled, as the Pythagorean theorem can be applied directly.