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Warm Up • Translate the following coordinates: (-3, -2)(-2, 2)(0,4) (x + 2, y – 4) On the graph to the right, translate the Figure (x + 4, y – 3) Chapter 13.5 • Vocabulary: • Reflection • Line of reflection Chapter 13.5 • Vocabulary: • Reflection • Line of reflection Is this a reflection? Is this a reflection? • To mathematically describe a reflection using coordinate notation, you write it as the following: (x,y) (x, -y) (x,y) (-x, y) Draw a triangle with vertices (-4, 1) (-1,1) (-3,4) reflection across the y-axis Draw a triangle with vertices (-5, 2) (0,1) (-3,5) reflection across the x-axis Draw a triangle with vertices (-8, -3) (-4,-3) (-6,-8) reflection across the x-axis Is this a reflection? • A figure has line symmetry if a line, called the line of symmetry, divides the figure into two parts that are reflections of each other in the line How many lines of symmetry does this figure have? How many lines of symmetry does this figure have? How many lines of symmetry does this figure have? Homework • Page 736 #’s 1-17all