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随着数学教学改革的深入,各地的试题不断推陈出新,以图形滚动为背景的问题是一类很好的新题型.解决这类问题要动中取静,通过分析滚动前后图形位置的变化,寻找运动路径及各元素之间的关系,用弧长、扇形等知识求解.一、正三角形的滚动例1一块等边三角形的木板,边长为1,现将木板沿
With the deepening of mathematics teaching reform, the examination questions in various regions have been continuously updated. The problem with graphic scrolling is a good new type of problem. Solving this type of problem requires taking a static motion and analyzing the changes in the position of the graphic before and after scrolling. Find the relationship between the movement path and each element, and use the arc length, fan shape and other knowledge to solve. First, the scroll of the equilateral triangle 1 equilateral triangle of the wood, the side length is 1, now the edge of the wood