# how extrude one vertex into +Z with fixed angle with xy plain?

I have mesh as xy plain
I want to extrude one vertex into +Z with fixed angle with xy plain (ie 24 deg) I don't care about horizontal angle (0-360 deg) because I want to move freely to change length and horizontal angle while vertical angle is fixed I know that I can change dx dy dz , length and destination xyz but I need fixed angle