# Transformations Unit – Reflections

Subject:

Math

9, 10, 11, 12

Title – Transformations Unit – Reflections
By – Cornelia Taran

 Transformation Unit: Lesson Plan 1 – Translations Lesson Plan 2 – Reflections (below) Lesson Plan 3 – Rotations

Lesson Plan 2: Reflections

Content:

The students will identify and locate reflections

Benchmarks:

G3.1: Distance-preserving transformations – isometries

Learning Resources and Materials:

• Transformation Tool
• Navigation through Geometry, NCTM
• Translucent paper
• Pictures with reflections

Development of Lesson:

Introduction:

Objectives:

The students will identify and locate reflections

Anticipatory Set:

Show pictures of geometric patterns and asked the students to describe the patterns that they see.

Lesson:

• Explain that geometric patterns can be created using slides, flips, turns, and dilations, which are types of transformations.
• A reflection can be seen in water or in a mirror. An object and its reflection have the same shape and size, but the opposite orientation.
• Define: image, preimage and isometry.
• Use translucent paper to create reflections.

Methods/Procedures:

1. Ask the students to draw a shape and a line on tracing paper. Draw a point on the line to use as a reference point.
2. Place a second paper on top of the original, and trace the figure, the line and the point.
3. Flip Sheet 2 over, and put it under the original. Align the lines of reflection and the reference points.
4. Trace the image from Sheet 2 onto the original sheet. Label the original figure and the reflected figure.

Allow working with a partner

Assessment Evaluation:

Formative – monitor and provide feedback.

Closure:

Draw a shape, a mirror line, and the image of the shape reflected across the mirror line.

E-Mail Cornelia Taran !