一、重点知识回顾1、“图形的认识”(1)点、线、面的认识·(2)角的认识·(3)相交线与平行线的认识·(4)三角形:三角形及有关概念;三角形的角平分线、中线和高的画法,三角形的稳定性;三角形中位线的概念和性质;全等三角形的概念、性质与两个三角形全等的条件;等腰三角形的有关概 I. Review of key knowledge 1. “Cognition of graphics” (1) Recognition of points, lines, surfaces (2) Understanding of angles (3) Recognition of intersecting lines and parallel lines (4) Triangles: Triangles and related concepts The angle bisector of the triangle, the delineation of the midline and height, the stability of the triangle; the concept and nature of the bitline in the triangle; the concept and nature of the equal triangle; the condition of the two triangles congruent;