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Adjacent angles

<ACD and <BCD are adjacent angles. Move the slider to change the position of the point D.

  1. What are the conditions for a pair of angles to be adjacent?
  2. What do you observe as the position of the point D changes?
  3. What is the geometric term used to describe a pair of angles whose sum is 180°?
  4. Describe fully, the relationship between <ACD and <BCD.