# The probability distribution for vertex degree in a unit disc graph generated from random points on a plane

Imagine I cover an arbitrarily large plane with randomly placed points at some density $\rho$ s.t. the number of points in any randomly sampled area $A$ (of arbitrary shape and size) is $\approx A*\rho$. We form a graph $G$ by connecting any pair of points with an edge if they are within unit length distance of one-another. Here, $G$ should be a sort of random unit disc graph.

Provided $\rho$, what is the probability that a randomly sampled vertex has degree $v = {0,1,2,...}$? If I select a set of points in a rectangular or circular area $A$ (which should introduce some bias), what is the expected probability distribution for the degree of vertices in the chosen set?

Also, I've been reading through the literature on percolation, but a heads up for a good paper relevant to the aforementioned graph $G$ in my question would be much appreciated!

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If you use an arbitrarily large plane, or even better, a sphere or torus, shouldn't the degree of a vertex just be Poisson-distributed? I don't really understand the second paragraph, so maybe it could use some clarification. Colourings of random geometric graphs has been studied quite a lot, including by user RJK, who will probably come by in the near future with a more intelligent response. – Andrew D. King Apr 6 '13 at 18:10