  In this paper, we define the angle of a bounded linear operator $A$ along an
unbounded path emanating from the origin and use it to characterize
range-kernel complementarity. In particular we show that if $0$ faces the
unbounded component of the resolvent set, then $X=R(A)\oplus N(A)$ if and only
if $R(A)$ is closed and some angle of $A$ is less than $\pi$.
