IM 8.1.9 Practice: Moves in Parallel

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• Offline Activity (.zip)

• GeoGebra Files

  1. Draw parallel lines AB and CD. Pick any point E. Rotate AB 90 degrees clockwise around E. Rotate CD 90 degrees clockwise around E. (.ggb)
     
  2. Use the diagram to find the measure of the angle indicated. Explain your reasoning. (.ggb)
     
  3. Points P and Q are plotted on a line. Move point R so that a 180-degree rotation with center R sends P to Q and Q to P. (.ggb)
     
  4. In the picture triangle A'B'C' is an image of triangle ABC after a rotation. The center of rotation is D. (.ggb)