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“网格”因其构造的不同,可分为正方形网格、矩形网格、平行四边形网格、正三角形网格、正六边形网格等等。由于“网格”型试题具有直观性、可操作性,能考查学生的识图、分析、归纳、动手操作等多种能力,因而以网格为背景的试题频频出现在各省市的中考数学试卷中。下面我们就研究与网格有关的计算问题。一、网格与线段、弧长在“网格”中经常用勾股定理求线段的长度,再利用所求的线段长度来解决相关的问题。而“网格”中的旋转变换又给弧长的计算提供了广阔的舞台。
“Grid ” Because of its different structure, can be divided into square grid, rectangular grid, parallelogram grid, regular triangle grid, regular hexagon grid and so on. Because of the “grid ” type questions intuitive, maneuverability, students can check the knowledge map, analysis, induction, hands-on operation and other abilities, and thus the grid as the background of the questions frequently appear in the provinces in the test Math papers. Below we study grid computing issues. First, the grid and line segments, arc length In the “grid ” Pythagorean theorem often find the length of the line segment, and then use the length of the line segment to solve the related problems. The rotation transformation in “grid ” provides a vast stage for arc length calculation.