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只用直尺(无刻度)作图问题,具有趣味性、探索性、创造性,它注重数学思维的考查.由于少了圆规的相助,直尺只能用来画直线、射线或线段,以及由它们组合成的图形.解答此类问题时,在动手操作探索作图思路的过程中,我们会感受到数学创造的乐趣.下面举例说明.一、作三角形的高例1已知AB是半圆的直径,图1中,点C在半圆外,图2中,点C在半圆内,请仅用无刻度的直尺,
Only ruler (no scale) mapping problem, with fun, exploratory, creative, it focuses on mathematical thinking test. Due to the lack of compasses, ruler can only be used to draw straight lines, rays or lines, and by They form a combination of graphics.To solve these problems, in the hands-on exploration of mapping ideas in the process, we will feel the pleasure of mathematical creation.Examples for the following: First, as a high example of a triangle AB is known to be semicircular Diameter, in Figure 1, the point C in the semicircle, Figure 2, the point C in the semicircle, please use only the scale without ruler,