reflections

reflections

reflections are a transformation where a figure is flipped over a line. Also called flip.

Vocabulary you will need to know

• Transformation: an operation that maps a geometric figure, pre image, onto a new figure, image.

• Image: the resulting figure after a transformation

• Pre image: the original figure before a transformation

Multiple Choice

What is the correct way pairs for the triangle ABC across the x-axis. The pre image points are : A(2,2), B(2,6), C(5,6)

• A'(2,-2)

  B'(2,-6)

  C'(5,-6)

• A'(0,3)

  B'(2,-5)

  C'(0,-4

• A'(-2,2)

  B'(-2,6)

  C'(-5,6)

• A'(2,6)

  B'(5,2)

  C'(2,2)

How to find the reflection

• Step 1: determine if you are going across the x or y-axis

• Step 2: y-axis = the x-values change, x-axis = the y-values change

• Step 3: determine the new points

• Step 4: graph the new image

Fill in the Blank

What is the new image points across the x-axis? triangle ABC

A(1,3)

B(1,8)

C(5,8)