Access Point #: MAFS.912.G-SRT.1.AP.1a (Archived Access Point)


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Given a center and a scale factor, verify experimentally that when dilating a figure in a coordinate plane, a segment of the pre-image that does not pass through the center of the dilation, is parallel to its image when the dilation is performed. However, a segment that passes through the center remains unchanged.

Clarifications:

Essential Understandings

Concrete:

  • Use manipulatives or geometry software to model dilation.
  • Identify if the dilation makes the figure bigger or smaller.
  • Determine if a figure has been dilated.
  • Online activity manipulating figures with a scale factor.
Representation:
  • Use appropriate tools to multiply or divide something by the scale factor.
  • Use a computer program to scale an object to a larger or smaller size.
  • Use appropriate tools to find the dimensions of a figure.

Number: MAFS.912.G-SRT.1.AP.1a Category: Access Points
Date Adopted or Revised: 06/14 Cluster: Understand similarity in terms of similarity transformations. (Geometry - 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.