一、研究背景教学实践表明,学生在理解各种三角形、各种四边形之间的关系时,经常会出现条理不清的情况,这无疑对于学生空间观念的建立产生消极影响。为了有效地消化上述知识概念,需要一种教具来直观地演示和说明。而借助传统图形教具在解决上述问题时会暴露出功能单一、操作笨拙、不利于综合使用、不够直观等突出缺点,往往需要借助多个教具才能达到演示效果。为此,我设计了一款多功能四边形教具,成本较低,却能有效解决上述难题,该 First, the research background Teaching practice shows that students understand the relationship between various triangles, various quadrilaterals often appear unclear situation, which undoubtedly has a negative impact on the establishment of student space concept. In order to effectively digest the above concept of knowledge, a teaching aid is needed to demonstrate and explain it intuitively. However, with the help of traditional graphic aids, the problems such as single function, clumsy operation, unfavorable use of comprehensiveness and lack of intuition are exposed, and many teaching aids are often required to achieve the demonstration effect. To this end, I designed a multi-functional quadrilateral teaching aids, lower cost, but it can effectively solve the above problems, the