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