対たい角かく

noun

diagonal

Refers to a diagonal line or direction, often used in geometry or describing positions.

• 正せい方ほう形けいの対たい角かく線せんを引ひく。

  Draw a diagonal line of the square.

noun

opposite angle

Specifically the angle opposite a given side or vertex in a polygon, a technical geometry term.

• 三さん角かく形けいの一いっ辺ぺんとその対たい角かくの関かん係けいを調しらべる。

  Examine the relationship between a side of a triangle and its opposite angle.