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Khan Academy

Khan Academy: Reflect Shapes

For Students 9th - 10th Standards
Given a figure and a definition of a reflection, draw the image. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Activity
Rice University

Rice University: Cynthia Lanius: Dueling Pinwheels (Geometer's Sketchpad)

For Teachers 9th - 10th
An introductory look at the interactive Geometer's Sketchpad in terms of using it to explore rotations, translations, and reflections. Only a beginner's amount of skill with the program is needed. Exploration questions are given for the...
Assessment
Oswego City School District

Regents Exam Prep Center: General "Transformation" Vocabulary

For Students 9th - 10th Standards
This site offers a short discussion of transformations. The discussion has few pictures and expresses the transformations in terms of relative coordinates rather than pictures.
Activity
Shodor Education Foundation

Shodor Interactivate: Transmographer

For Students 9th - 10th Standards
Shodor Education Foundation provides an applet that "allows the user to explore the world of transformations, reflections, and rotations. It allows the user to translate triangles, squares, and parallelograms on both the x and y-axes."
Handout
Varsity Tutors

Varsity Tutors: Hotmath: Similar Figures

For Students 9th - 10th Standards
Find a clear explanation of similar figures. Discusses how they can be transformed through a sequence of rotations, reflections, translations, and dilations. Explanations are supported with illustrated examples.
Whiteboard
ClassFlow

Class Flow: Transformations in Geometry

For Teachers 3rd - 5th
[Free Registration/Login Required] This flipchart was designed to introduce fourth grade students to transformations in geometry. It includes translations, reflections, and rotations.
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.
Activity
Analyze Math

Analyze Math: Reflection Across a Line

For Students 9th - 10th Standards
Reflect any point, line segment, triangle, or any other figure over one or two lines using this dynamic applet. Points and lines are entered by point-and-click rather than by typing equations or ordered pairs. A very neat exercise to...
Activity
Texas Instruments

Texas Instruments: Changing Functions

For Teachers 9th - 10th
Students can use as an assessment-discovery lesson after talking about reflections and transformations of functions
Website
Other

P.u.e.m.a.c.: Galeria De Transformaciones

For Students 9th - 10th Standards
Enjoy constructions created by rotations, reflections and translations. [Requires Java.]
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.
Interactive
Shodor Education Foundation

Shodor Interactivate: Transmographer 2

For Students 9th - 10th Standards
Build your own polygon and transform it in the Cartesian coordinate system. Experiment with reflections across any line, rotations about any point, and translations in any direction.
Activity
Texas Instruments

Texas Instruments: Mapping a Leaf

For Teachers 6th - 8th Standards
In this activity, students will identify and record ordered pairs from a coordinate plane. They will examine symmetry about the axes, reflections, and symmetry in nature. They understand geometric concepts like area and perimeter, and...
Activity
Texas Instruments

Texas Instruments: Traveling Shapes Motion Geometry

For Teachers 6th - 8th Standards
In this activity, students describe how to move a shape from one place to another in a plane. They learn about translations, rotations, and line reflections. [Requires Adobe Reader.]
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
E-learning for Kids

E Learning for Kids: Math: Living in the Mill: 2 D Shapes

For Students 2nd - 3rd
Students can use this interactive site to practice various geometric concepts such as rotations, reflections, translations, tesselations and geometric patterns.
Whiteboard
ClassFlow

Class Flow: Pentominoes

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Students use geometric sense to create congruent shapes and figures in multiple orientations using transformations.