  We study circle packings with the combinatorics of a triangulated disk in the
plane and parametrize deformations of circle packings in terms of vertex
rotation and cross ratios. We show that there is a Weierstrass representation
formula relating infinitesimal deformations of circle packings to discrete
minimal surfaces of Koebe type. Furthermore, every minimal surface of Koebe
type can be extended naturally to a discrete minimal surface of general type.
In this way, discrete minimal surfaces via Steiner's formula are unified.
