犤教学内容犦三角形两边之和大于第三边(自编教材)。犤教学目标犦1.通过动手操作体会到:三根小棒有时能围成三角形,有时围不成三角形。2.从没有围成三角形的两种情况中,猜想能围成三角形的三根小棒具备怎样的关系,即三角形三条边之间的关系,并用多种方法进行验证。3.培养逻辑思 犤 teaching content 和 triangle on both sides of the greater than the third side (self-compiled textbooks).犤 Teaching Objectives 犦 1. Through hands-on experience: three small rods can sometimes be surrounded by a triangle, sometimes not around the triangle. 2. From the two cases that did not form a triangle, guess what the relationship between the three small triangles that can form a triangle, that is, the relationship between the three sides of the triangle, and use a variety of methods to verify. 3. Cultivate logical thinking