AlgèbreFacile
Math Learning PlatformBasic Geometry
Beginner
📚 geometrie
📖 About this lesson
Discover geometric shapes and their properties
Lesson Content
Basic Geometry
Geometry studies ,[object Object],, ,[object Object], and ,[object Object], of objects.
Basic shapes
Triangle
- •3 sides
- •3 angles
Sum of angles = 180°
Rectangle
- •4 sides
- •4 right angles (90°)
- •Opposite sides equal
Circle
- •No sides
- •All points equidistant from center
Perimeter calculation
[object Object], P = 2(length + width) ,[object Object], P = 4 × side ,[object Object], P = 2πr
Area calculation
[object Object], A = length × width ,[object Object], A = (base × height) / 2 ,[object Object], A = πr²
Practical Examples
1
Example 1
📋 Problem
Calculer le périmètre d'un rectangle de longueur 8 cm et largeur 5 cm
✅ Solution
26 cm
💡 Explanation
P = 2(8 + 5) = 2(13) = 26 cm
2
Example 2
📋 Problem
Calculer l'aire d'un triangle de base 10 cm et hauteur 6 cm
✅ Solution
30 cm²
💡 Explanation
A = (10 × 6) / 2 = 60 / 2 = 30 cm²