  Let $S$ be a commutative noetherian ring. The extensions of matrix
factorizations of non-zerodivisors $x_1,\dots,x_n$ of $S$ form a full
subcategory of finitely generated modules over the quotient ring $S/(x_1\cdots
x_n)$. In this paper, we investigate the radius (in the sense of Dao and
Takahashi) of this full subcategory. As an application, we obtain an upper
bound of the dimension (in the sense of Rouquier) of the singularity category
of a local hypersurface of dimension one, which refines a recent result of
Kawasaki, Nakamura and Shimada.
