Perimeter Calculations for Geometric Shapes

This page provides a comprehensive overview of how to calculate the perimeter of complex figures and various geometric shapes. It serves as an excellent resource for students, particularly those in 6ème (6th grade), learning about perimeters.

The page is divided into sections, each focusing on a different shape and its corresponding perimeter formula:

1. Rectangle: The formula for the perimeter of a rectangle is presented as P = L x l x 2, where L is the length and l is the width.

2. Square: For a square, the perimeter formula is given as P = C x 4, where C is the length of one side.

3. Triangle: The perimeter of a triangle is calculated by adding the lengths of all three sides, represented as P = D + E + F.

4. Circle: The formula for the perimeter of a circle (circumference) is shown as P = 2 x π x R, where R is the radius of the circle.

Definition: The perimeter of a closed geometric figure is defined as the measure of its contour or outer boundary.

Example: For a rectangle with dimensions 3 and 4, the perimeter calculation would be: P = (3 + 4) x 2 = 14.

Highlight: The page emphasizes the importance of understanding these formulas for calculating perimeters of both regular and irregular shapes.

Vocabulary:

• Périmètre: Perimeter
• Carré: Square
• Rectangle: Rectangle
• Triangle: Triangle
• Cercle: Circle

This comprehensive guide serves as an excellent resource for students learning about geometric shapes and their properties, particularly focusing on how to calculate the area of irregular figures and perimeters of various shapes. It provides a solid foundation for more advanced geometric concepts and practical applications in real-world scenarios.