2.02 Reflections

TRANSFORMATIONS AND CONGRUENCE : 02.02 REFLECTIONS

What is a reflection?

A reflection is a type of transformation that creates a mirror image of the pre-image across a line of reflection.

Multiple Choice

There are ____ different lines of reflections.

• 2

• 3

• 4

• 5

Images are created across four different lines of reflection

• Across the x-axis

  • (x, y) → (x, −y)

• Across the y-axis

  • (x, y) → (−x, y)

• Across the line y = x

  • (x, y) → (y, x)

• Across a horizontal or vertical line

  • Count the distance between each point on the figure and the line of reflection. Then, for each point, count this same distance from the line of reflection to find the corresponding point.

Geometry

​Let's look at the Reflections across x and y axies

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​Reflection Across the X and Y Axis

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Multiple Choice

Identify the line of reflection of poin P?

• X-axis/ Y = 0

• Y-axis/ X = 0

Multiple Choice

What is the line of reflection of triangle ABC?

• X-axis/ Y = 0

• Y-axis/ X =0