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一、明确考纲要求1.理解补角、余角、对顶角的概念,探索并掌握对顶角相等,同角(等角)的余角相等,同角(等角)的补角相等的性质.2.理解垂线、垂线段等概念,了解垂线段最短的性质,理解点到直线距离的意义.3.掌握过一点且仅有一条直线垂直于已知直线,会用三角尺或量角器过一点画一条已知直线的垂线.4.理解线段垂直平分线及其性质.
First, a clear test syllabus requirements 1. Understand the concept of supplementary angle, extra corner, right angle, to explore and grasp the right angle equal, the same angle (equiangular) the same angle, same angle (equiangular) supplementary angle equal Nature .2 understand vertical line, vertical line segment concept, understand the vertical section of the shortest nature, understand the meaning of the point to the straight line distance .3 master a little and only a straight line perpendicular to the known line, will use a triangular ruler or protractor Draw a vertical line of a known line a little 4. Understand the line perpendicular bisector and its properties.