Introduction to Polygons

This page explores the concept of polygons, with a particular focus on various regular polygons and their properties in plane geometry.

Definition: A polygon is defined as a closed plane figure bounded by straight lines.

Vocabulary:

• Pentagon: A five-sided polygon
• Hexagon: A six-sided polygon
• Octagon: An eight-sided polygon

Highlight: The page emphasizes that triangles are the simplest form of polygons, serving as a foundation for understanding more complex geometric shapes.

Understanding Triangles

This page introduces the fundamental concepts of triangles and their various types in geometry. The content focuses on the basic characteristics and classifications of triangles, essential for sixth-grade mathematics.

Definition: A triangle is a polygon with exactly three sides and three angles.

Highlight: Triangles can be classified into four main categories: right triangle (triangle rectangle), equilateral triangle (triangle équilatéral), isosceles triangle (triangle isocèle), and scalene triangle (triangle quelconque).

Example: The page includes visual representations of each triangle type, showing their distinct characteristics:

• Right triangle: Contains one 90-degree angle
• Equilateral triangle: All sides and angles are equal
• Isosceles triangle: Two sides and two angles are equal
• Scalene triangle: No sides or angles are equal