Help with a Sketch Relation in SolidWorks

Hi everyone! I'm new to SolidWorks and I'm having trouble with a specific sketch relation. I'm working on a university practice, and I need to replicate all the relations shown in the reference sketch. I've managed to complete most of them, but I'm stuck on one.

There's a relation that involves a blue dot positioned in the middle of a line (it looks similar to a perpendicular relation but with a point in between). I’m not sure how to create this or what it’s called. Could someone explain how to do it?

Thanks in advance for the help!

https://preview.redd.it/3tw23s2fg0he1.png?width=243&format=png&auto=webp&s=42c9905c47193e7762932dd4b28663ba72f7c5f0