Help with some Blueprint vector calculation

@dorusoftware I would like you to understand my situation…
Not necessary to read, but I’d like you to do

why do you think the people know how to do it in bp? I don’t think is something you do each day…
In my case, I have no idea how to do it by hand right now, last time I use was 8 years ago…

So first I read the post, then I thought about how to resolve it, at some point eureka… oh I think I can make a triangle, and … I was looking for the pitagoras in several pages… I look at the case in maths…

When I was sure at 90% about to solve by tracing lines and making a triangle, I phoned my uncle to be sure, because is a mathematician at 00 of the night

Then I said “oh sure there is an example in the content examples in the math level”
I did install, look, and yes… then I share…
OH here is the blueprint! Just a few changes

And imagine my face when you told me

Not even read!!!

I tell to you because I understand you are stressed and in a hurry, but please…