対たい角かく線せん

noun

diagonal line; diagonal

Refers to a line segment connecting non-adjacent vertices in a polygon, or more generally a line running obliquely across a shape or space.

• 正せい方ほう形けいの対たい角かく線せんの長ながさを計けい算さんする。

  Calculate the length of the diagonal of a square.

• 画が面めんの対たい角かく線せんの長ながさは15インチです。

  The screen's diagonal length is 15 inches.