7.GM.4.3 Graph and describe translations and reflections of figures on a coordinate plane and determine the coordinates of the vertices of the figure after the transformation.
In a Nutshell
Translate and reflect figures on a coordinate plane by graphing. Describe the actions in words and mathematically.
Student Actions
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Teacher Actions
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Develop the ability to make conjectures, model and generalize transformations on the coordinate plane.
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Develop the ability to communicate mathematically the effect of transformations on the vertices of a polygon.
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Implement tasks that promote reasoning and problem solving by using and connecting graphs and descriptions of transformations on a coordinate plane to deepen understanding of translations and reflections.
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Pose purposeful questions about the effect of transformations on polygons on the coordinate plane.
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Key Understandings
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Misconceptions
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Reading and writing points on the coordinate plane.
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Graphing points on the coordinate plane.
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Translation is a slide of an object.
- Reflection is a mirror image of an object over a specified line.
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Students may reflect the figure across the wrong line of reflection (i.e. the y-axis instead of the x-axis).
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Students may not know the difference between the original object and the translated object.
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Students may not know the difference between the original object and the reflected object.
- Students may struggle to determine the coordinates of the transformations.
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OKMath Framework Introduction
7th Grade Introduction
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