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Challenge: The Theorem of Thales

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Before you begin this challenge, explore the “Theorem of Thales” below. Task: What did the Greek philosopher and mathematician Thales find out about a triangle inscribed in a semicircle, about 2600 years ago? Hint: Explore the dynamic figure below and write down your discoveries.

Tasks

  1. Construct an interactive visualization of the Theorem of Thales that can be used to rediscover this theorem. 
  2. Try to come up with a graphical proof for this theorem. Hint: Create midpoint O of segment AB and display the radius OC as a segment.

Accept the challenge...