G-CO.2.6

Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure; given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent.

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Formative Assessments
Formative Assessments
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Students will determine whether two given trapezoids are congruent.
Congruent Trapezoids
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Students are asked to describe what happens to a triangle after repeated reflections and rotations.
Repeated Reflections and Rotations
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Students are asked to translate and rotate a triangle in the coordinate plane and explain why the pre-image and image are congruent.
Transform This
Virtual/Hands-on Manipulatives
Virtual/Hands-on Manipulatives
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This manipulative is a virtual realization of the kind of physical experience that might be available to students given three pieces of straws and told to make them into a triangle.
Congruent Triangles
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Assessment Questions
Assessment Questions
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FSA Sample Question
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Videos of Expert Instruction
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Use Real Link and Title
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Math Literature
Math Literature
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Students begin by using the context of skytyping to create a message and translate it into a set of coordinates.
How Do Skytypers Write Messages?
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This lesson provides a real-life context for transformations including rotations, reflections, and translations which are the foundation for how the Common Core State Standards require students to understand congruence and similarity. Rather than begin the lesson by defining the terms and identifying them in the game, the goal is to let students initially describe the movements in their own words and then guide them towards a mathematically precise definition.
How Did They Make Ms. Pac-Man?
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