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Title - Transformations Unit - Reflections
By - Cornelia Taran
Primary Subject - Math
Grade Level - 9-12
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:
- 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.
- Place a second paper on top of the original, and trace the figure, the line and the point.
- Flip Sheet 2 over, and put it under the original. Align the lines of reflection and the reference points.
- Trace the image from Sheet 2 onto the original sheet. Label the original figure and the reflected figure.
Accommodations/Adaptations:
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.
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