教学内容三角形的特征、特性、分类、内角和、三角形的高。【教学目标】1.使学生进一步掌握三角形各部分的名称与意义、三角形内角和、三角形分类的有关知识。2.巩固掌握三角形的特性,三角形任意两边之和大于第三边以及三角形的内角和是180°。3.知道锐角三角形、直角三角形、钝角三角形和等腰三角形、等边三角形的特点并能够辨认和区别它们。 Teaching Content Triangle features, characteristics, classification, interior angles, and triangle height. 【Teaching Objectives】 1. To enable students to further grasp the name and meaning of each part of the triangle, triangle and triangle, triangle classification of knowledge. 2. Consolidate the characteristics of the triangle, the sum of any two sides of the triangle is greater than the third and the interior angle of the triangle is 180 °. 3. Know acute triangle, right triangle, obtuse triangle and isosceles triangle, equilateral triangle features and can identify and distinguish them.