The théorème de Thalès is a fundamental geometric principle that establishes proportional relationships between similar triangles. This theorem is essential for calculating unknown lengths and understanding geometric proportions.
- The theorem states that when a line is parallel to one side of a triangle and intersects the other two sides, it creates similar triangles with proportional sides
- Applications include calculating lengths in geometric figures using proportionnalité des triangles
- The theorem can be used for both enlargement and reduction calculations
- Practical calcul des longueurs avec théorème de Thalès involves setting up proportional equations
