Triangles

Ryan Windle

Triangles and relationships of segments within them. Also includes constructions.


  • 1. Triangle Vocabulary
  • 2. Nagelscher Punkt, Inkreismittelpunkt, Schwerpunkt
  • 3. Area Of A Triangle
  • 4. Menelaus Theorem (Proof)
  • 5. Menelaus Theorem (Introduction)
  • 6. Menelaus Theorem (Transversal)
  • 7. Menelaus Theorem (non-parallel transversal)
  • 8. Angle Properties of Polygons
  • 9. Congruent Triangles: Angle - Side - Angle
  • 10. Congruent Triangles: Side - Side - Side
  • 11. Congruent Triangles: Side - Angle - Side
  • 12. Types of Triangles
  • 13. Proof of Pythagorean Theorem
  • 14. A Simple Pythagorean Proof
  • 15. Ladder against the wall
  • 16. Pythagoras Theorem
  • 17. Side-Side-Angle - The Ambiguous Case
  • 18. Exploring Triangle Centers in Depth

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Triangle Vocabulary

Drag point A to see how the parts change.
– GeoGebra Materials Team

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