Activity
National Council of Teachers of Mathematics

Nctm: Illuminations: Composing Reflections

For Students 6th - 8th Standards
Examine the result of reflecting a shape successively through two different lines.
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Khan Academy

Khan Academy: Determine Reflections (Advanced)

For Students 9th - 10th
Given two figures on the coordinate plane, draw the line of reflection that takes one figure to another.
Study Guide
Oswego City School District

Regents Exam Prep Center: Reflection in a Line

For Students 9th - 10th Standards
This site gives some examples of line reflection transformations. Includes coordinate graphs to show reflections of lines and shapes.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Congruent Segments

For Teachers 8th Standards
Eighth graders are shown two line segments that are the same length and must describe a sequence of reflections that exhibits a congruence between them. Aligns with 8.G.A.2.
Unit Plan
Mathigon

Mathigon: Geometry: Rigid Transformations

For Students 9th - 10th Standards
This lesson focuses on rigid transformations, a specific set of rules that convert one geometric figure into another one. There are many different types of transformations, like reflections or rotations. It provides several practice...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Reflecting a Rectangle Over a Diagonal

For Teachers 8th Standards
In this task, 8th graders are presented with several rectangles that have diagonal lines through them and are placed on grids. They are asked to draw reflections and to discuss rectangles that are squares. Aligns with 8.G.A.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Point Reflection

For Teachers 8th Standards
In this task, 8th graders are given the coordinates of a point and are asked to find the coordinates of its reflection across a line parallel to the x-axis. Aligns with 8.G.A.3.

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