理解轴对称应注意:(1)沿某一条直线对折后能够完全重合.(2)轴对称的两个图形一定是全等图形.但两个全等的图形不一定是轴对称.(3)对称轴是直线,不是线段或射线.(4)轴对称图形的对称轴有的只有一条,有的则存在多条(如圆);轴对称的两个图形的对称轴也不一定唯一(如两条互相垂直的直线).线段、角、等腰三角形、长方形、菱形、正多边形及圆都是常见的轴对称图形.说两个图形对称,必须说它们关于哪条 Understand the axisymmetric should pay attention to: (1) along a straight line after the fold can be completely overlap (2) axisymmetric two graphics must be congruent graphics, but the two congruent graphics are not necessarily axisymmetric (3) Symmetry axis is a straight line, not a line segment or a ray. (4) There is only one axis of symmetry of the axisymmetric graph, while others are many (such as a circle); the symmetry axes of the two axisymmetric graphs are not necessarily unique Two lines perpendicular to each other.) Line segments, angles, isosceles triangles, rectangles, rhombuses, regular polygons, and circles are all common axisymmetric graphics. Say that the two graphics are symmetrical and must say which of them