Unit 1: Graphic transformation 1. Axisymmetric figure: a figure is folded in half along a straight line, and the figures on both sides can completely overlap. This graph is an axisymmetric graph. This straight line is called its axis of symmetry. 2. The characteristics of axisymmetric graphs are: (1), and the distance from symmetrical points to the axis of symmetry is equal; (2) The connecting line of the corresponding points and the symmetry axis are perpendicular to each other. 3. Rotation: The phenomenon that a figure or an object moves around a point or an axis is called rotation. 4. Fold a graph along a straight line. If the parts on both sides of a straight line can completely (overlap), then the figure is said to be symmetrical about this straight line, and the straight line where the crease is located is called (symmetry axis). 5. In an axisymmetric figure, the distances from the corresponding points on both sides of the axis of symmetry to the axis of symmetry are (equal). 6. A rectangle has (2) symmetry axes, a square has (4) symmetry axes, an equilateral triangle has (3) symmetry axes, an isosceles triangle has (1) symmetry axes, an isosceles trapezoid has (1) symmetry axes, a circle has (countless) symmetry axes and a semicircle has (/kloc-0)