梯形概念引入教学设计一例庐江县城关小学张星北＂梯形的认识＂是小学平面几何图形教学的最后一节。由于梯形的内涵较三角形、平行四边形更难理解，加上初学时学生易与平行四边形混淆。因此，我在教学时抓住这个难点，巧妙而又准确地引入新课，为揭示梯形概念的内涵，起到... The introduction of the trapezoidal concept into teaching design An example of the teaching of ladder geometry in Chengguan Primary School of Qijiang County is the last section of teaching of plane geometry in primary schools. Because the connotation of trapezoids is more difficult to understand than triangles and parallelograms, students are confused with parallelograms when they are new to beginners. Therefore, when I was teaching, I seized this difficult point and introduced the new lesson skillfully and accurately. In order to reveal the connotation of trapezoidal concept, I played...