対角(たいかく)

たいかく
noun
diagonal; opposite angle
1. diagonal; opposite angle
in geometry, refers to a line connecting opposite corners or the angles at opposite corners
正方形(せいほうけい)の対角(たいかく)線(せん)を引(ひ)く。
Draw a diagonal line on a square.
対角(たいかく)にあるコーナーに移動(いどう)する。
Move to the diagonally opposite corner.
平行四辺形(へいこうしへんけい)の対角(たいかく)は等(ひと)しい。
The opposite angles of a parallelogram are equal.

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

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

KEY 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).

general
Added 2026.1.28 12:31 · Revised 2026.3.25 21:24
08500/08725_taikaku