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关于垂线,同学们在小学里已接触过,但那仅仅停留在感性认识上,没有对垂线进行概念描述.七年级上册教科书通过图片及“议一议”活动,带大家一起回忆了小学里学过的相关知识,并遵循从感性到理性的认知规律归纳了垂线的定义,进而引出垂线段、点到直线的距离等概念.由于同学们的认识水平有限,往往会对这三个概念认识模糊,混淆不清,下面我们来一探究竟.
On the vertical line, the students have been exposed in primary school, but that only just stay in the perceptual knowledge, there is no concept of vertical description .7 grade textbook through pictures and The primary school has learned the relevant knowledge and follows the cognitive law from the perceptual to rational induction of the definition of the vertical line, and then leads to the vertical line segment, the distance from the point of view straight line due to the limited level of awareness of students often tend to These three concepts are vague and confused, so let’s take a closer look.