对角 (duì jiǎo) — opposite angles; diagonal

定義

例文

• 长方形的对角相等。
  Cháng fāng xíng de duì jiǎo xiāng děng.
  The opposite angles of a rectangle are equal.
• 连接这两个顶点的直线叫做对角。
  Lián jiē zhè liǎng gè dǐng diǎn de zhí xiàn jiào zuò duì jiǎo.
  The straight line connecting these two vertices is called a diagonal.
• 两条对角互相垂直。
  Liǎng tiáo duì jiǎo hù xiāng chuí zhí.
  The two diagonals are perpendicular to each other.