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Dilate common polygons using graph paper and identifying the coordinates of the vertices.
Clarifications:
Essential Understandings
Concrete:
- Use manipulatives (cookie dough, Play-Doh, clay, etc.) to demonstrate that the manipulative’s size can be changed by flattening, stretching, and rolling it (dilation).
- Using graph paper and manipulatives, demonstrate that a polygon can be dilated. E.g., Use manipulatives (cookie dough, Play-Doh, clay, etc.) to trace a figure, then flatten, stretch or roll the figure and trace it again. Identify the different coordinates.
- Using manipulatives, identify two figures that are the same shape and size.
- Using manipulatives, identify two figures that are different sizes but the same shape. Use the two figures to find the coordinates of the vertices.
- Understand the following vocabulary: dilate (dilation), polygon, coordinate, vertices, increasing and decreasing of size and scale.
- Draw two figures that are different sizes but the same shape on graph paper. Identify the different coordinates.
General Information
Number: MAFS.8.G.1.AP.3a
Category: Access Points
Date Adopted or Revised:
06/14
Cluster:
Understand congruence and similarity using physical models, transparencies, or geometry software. (Major Cluster) :
Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.
Related Standards
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