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Name: ______________________ Date: _______________ Math 9 Chapter 7 Similarity and Transformations Lesson 7.5 Reflections and Line Symmetry Line Symmetry - _________________________________________________________ _________________________________________________________ If we fold a shape along its line of symmetry, the parts match exactly Example 1: How many lines of symmetry does this pentagon have? Also, each point on one side of the line of symmetry has a ___________________ on the other side of the line. These two points are the _______________________, or ______________________ from the line of symmetry. A line of symmetry is also called a ___________________. Think of the line as a mirror. Example 2: Identifying Lines of Symmetry in Tessellations A tessellation is a pattern or arrangement that covers an area or plane without overlapping or leaving gaps. It can also be called a tiling pattern. How many lines of symmetry? Example 3: Identify the triangles that are related to the yellow triangle by a line of reflection Example 4: Quadrilateral ABCD is part of a larger shape. Complete the shape if ABCD is a: a) Reflection in the horizontal line through 2 on the y-axis. b) Reflection in the oblique (diagonal) line through (0, 0) and (6, 6). c) Reflection in the vertical line through 5 on the x-axis. Label each shape with the coordinates of its vertices a) b) c) Example 5: Copy each polygon onto grid paper. It is one-half of a shape. Use the given line of symmetry to complete the shape by drawing its other half. Label the shape with the coordinates of its vertices. a) Horizontal line through 1 on the y-axis. b) Vertical line through 5 on the x-axis. Assignment: Pages 357 – 359, #1 -6, 8 – 10, AFQ #7, Reflect