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垂直是两条直线的相互位置关系,它是直线相交的特殊情况.垂线在日常生活和生产中应用十分广泛,其概念和性质是我们今后学习的基础.学习时,应该注意以下几个要点:
Vertical is the mutual positional relationship between two straight lines. It is a special case where straight lines intersect. Vertical lines are widely used in daily life and production. Their concepts and properties are the basis for our future learning. When learning, we should pay attention to the following points :