Let k a regular noetherian
p -algebra, let A = k[x, y]/(xy) be the coordinate ring of the coordinate axes in the affine k-plane, and let I = (x,y) be the ideal that defines the intersection point. We evaluate the relative K-groups Kq (A, I) completely in terms of the big de Rham-Witt groups of k. This generalizes a formula for K1 (A, I) and K2 (A, I) by Dennis and Krusemeyer.