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同学们在小学里就已经对“垂直”有了初步的认识,在《平面图形的认识(一)》这一章中,课本通过图片和“议一议”活动,在具体情境中进一步丰富了对垂直的认识,实现从感性认识到理性认识的转变.一、与垂直有关的基本概念1.垂线的定义:如果两条直线相交所成的四个角中有一个角是直角,那么这两条直线互相垂直,其中的一条直线叫做另一条直线的垂线,它们的交点叫做垂足.2.垂线段的定义:垂线上一点到垂足之间的线段.
Students in primary school already have a preliminary understanding of “vertical ” in the “understanding of graphic graphics (a) ” chapter, textbooks through the picture and “discussion” activities, in specific contexts In the further enrichment of the vertical understanding of the realization of the change from perceptual awareness to rational understanding.First, with the basic concepts of vertical 1. Vertical definition: If the intersection of two straight lines into one of the four corners of a corner is Right angle, then the two straight lines perpendicular to each other, one of the straight lines called the vertical line of another, their intersection point is called foot .2. Definition of the vertical line: the vertical line between a point to the foot of the foot.