What is "contiguous angle"

Adjacent \Ad*ja"cent\, a. [L. adjacens, -centis, p. pr. of adjacere to lie near; ad + jac[=e]re to lie: cf. F. adjacent.] Lying near, close, or contiguous; neighboring; bordering on; as, a field adjacent to the highway. ``The adjacent forest.''
--B. Jonson.

Adjacent or contiguous angle. (Geom.) See Angle.

Syn: Adjoining; contiguous; near.

Usage: Adjacent, Adjoining, Contiguous. Things are adjacent when they lie close each other, not necessary in actual contact; as, adjacent fields, adjacent villages, etc.

I find that all Europe with her adjacent isles is peopled with Christians.
--Howell. [1913 Webster] Things are adjoining when they meet at some line or point of junction; as, adjoining farms, an adjoining highway. What is spoken of as contiguous should touch with some extent of one side or the whole of it; as, a row of contiguous buildings; a wood contiguous to a plain.