Thales' Theorem and Pythagorean Theorem Applications
This page delves into the practical applications of Thales' Theorem and the Pythagorean Theorem, providing detailed examples and solutions.
Thales' Theorem Example
The page begins with an example of the Théorème de Thalès formule 3ème, demonstrating its application in a specific geometric configuration.
Example: In a triangle ABC with points M and N on sides AB and AC respectively, where (MN) is parallel to (BC), the following proportion is used:
MN/BC = AM/AB = AN/AC
A step-by-step solution is provided:
- Given measurements: AB = 7.2 cm, AN = 2.4 cm, BC = 2.4 cm
- Using Thales' theorem: MN/2.4 = 2.4/7.2
- Solving for MN: MN = 2.4×2.4 / 7.2 = 0.8 cm
Highlight: The length of MN is calculated to be 0.8 cm, demonstrating the practical application of the Théorème de Thalès formule.
Pythagorean Theorem Application
The page then moves on to an example of the Pythagorean Theorem in a right-angled triangle.
Definition: The Pythagore calcul exemple states that in a right-angled triangle, the square of the hypotenuse is equal to the sum of squares of the other two sides.
Two examples are provided:
-
In triangle DEF, right-angled at D:
- Given: DE = 3 cm, DF = 4 cm
- Calculation: EF² = DE² + DF² = 3² + 4² = 25
- Result: EF = √25 = 5 cm
-
In triangle IJK:
- Given: IK = 4 cm, JK = 8.6 cm
- Calculation: IJ² = JK² - IK² = 8.6² - 4² = 63
- Result: IJ ≈ 7.94 cm
Highlight: These examples demonstrate how to use the Calcul Pythagore triangle rectangle for finding unknown side lengths in right-angled triangles.