# Find radius based on length chord of a segment of a circle

I need to find the right radius so my segment of a circle start and end on specifics coordinates.

For example: I got a segment that start at $[0,0]$ and I would like that it end at $[X=4750 / Y= -2000]$. For this example, I do know the length chord $= 5154$ (Pythagoras's theorem).

I tried something like this (see picture) but cannot isolate r... equation

Is it possible to find the radius? and how? Thanks for your help.