Types of Triangles and Their Properties

The page presents a detailed classification of different triangle types and their distinctive properties. Starting with the scalene triangle (triangle quelconque), it demonstrates how triangles can vary in their geometric characteristics.

Definition: A scalene triangle has three different angles and three different side lengths, making it the most general form of triangle.

Highlight: The right triangle (triangle rectangle) is distinguished by its 90-degree angle and hypotenuse, which is the longest side opposite to the right angle.

Example: In an isosceles triangle (triangle isocèle), two sides are equal in length, and consequently, two angles are also equal.

Vocabulary: The term "équilatéral" refers to an equilateral triangle, where all sides and angles are equal.

Definition: The identification des triangles équilatéraux is straightforward as they have three equal sides and three 60-degree angles.

Highlight: The right isosceles triangle (triangle isocèle rectangle) combines properties of both right and isosceles triangles, featuring one 90-degree angle and two equal sides, resulting in two 45-degree angles.