対角(たいかく)

A geometry term referring to opposite corners/angles of a shape, or the diagonal line connecting them.

Forms

対(たい) (opposite/facing) + 角(かく) (angle/corner)

Compounds

• 対角線(たいかくせん): diagonal line (connecting opposite corners)
• 対角(たいかく)にある: located diagonally opposite

Related geometry terms

• 対辺(たいへん): opposite side
• 隣(となり)角(かく): adjacent angle
• 正方形(せいほうけい): square
• 長方形(ちょうほうけい): rectangle

Usage

Primarily used in mathematics education and technical contexts. Also used outside geometry to describe something located diagonally across — for example, 交差点(こうさてん)の対角(たいかく) (diagonally across the intersection).