Definition

Examples

• 长方形的对角相等。
  Chángfāngxíng de duì jiǎo xiāngděng.
  The opposite angles of a rectangle are equal.
• 连接这两个顶点的直线叫做对角。
  Liánjiē zhè liǎng gè dǐngdiǎn de zhíxiàn jiàozuò 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 hùxiāng chuízhí.
  The two diagonals are perpendicular to each other.