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GeoGebraGeoGebra Classroom

2.04 Warm-up: Scale drawing of a segment

Creating a scale drawing using the ratio method:

  1. Draw a ray Toolbar Image beginning at the center through each vertex of the figure.
  2. Dilate each vertex along the appropriate ray by the scale factor. For example for a scale factor r = 1/2, find the midpoint Toolbar Image between the center and each vertex.
  3. Use the segment tool Toolbar Image to join the vertices in the way they are joined in the original figure.

Create a scale drawing of triangle ABC about center D and scale factor r = 1/2.