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Common Core Mathematics 9-12 
 ClusterUnderstand similarity in terms of similarity transformations
  
Topics1. Similarity, Right Triangles, and Trigonometry; 2. Geometry
   Grade 9-12
  G.SRT.1.Verify experimentally the properties of dilations given by a center and a scale factor:
a. A dilation takes a line not passing through the center of the dilation to a parallel line, and leaves a line passing through the center unchanged.
b. The dilation of a line segment is longer or shorter in the ratio given by the scale factor.