Capítulo 5 · Neste capítulo você vai

Parallelism

  • recognize alternate, corresponding and collateral angles;
  • prove the existence of parallel and understand Euclid’s postulate;
  • demonstrate that the sum of the angles of a triangle is 180°;
  • use the external angle and parallels to calculate angles.

Train tracks, the lines of a notebook, the edges of a road: parallel straights are everywhere. Watch the video lesson and then follow the theory.