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Thales' theorem

  • recognize bundles of parallel lines and their corresponding segments;
  • prove and apply Tales’ theorem;
  • divide a segment into equal parts with a ruler and compass;
  • use the internal and external angle bisectors theorems.
Thales of Miletus.
Thales of Miletus.
For Thales, the search for knowledge was the most beautiful thing.
For Thales, the search for knowledge was the most beautiful thing.
The sun’s rays are parallel: the pyramid and the stick form similar triangles with their shadows. Change the height of the Sun.