trihedral formed by three lines

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• trihedral — [trī hē′drəl] adj. [ TRI + HEDRAL] having three sides or faces [a trihedral angle] n. a figure formed by three lines, each in a different plane, that intersect at a point …   English World dictionary

• trigonometry — trigonometric /trig euh neuh me trik/, trigonometrical, adj. trigonometrically, adv. /trig euh nom i tree/, n. the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the… …   Universalium