AREA | Class 8 Mathematics Notes

Area of Rectangle

The area of a rectangle is the amount of space enclosed within its four sides. It is measured in square units such as square centimeters (cm²), square meters (m²), etc. To find the area of a rectangle, multiply its length (l) by its breadth (b). This formula comes from the fact that a rectangle can be divided into unit squares arranged in rows and columns. The total number of these unit squares is length × breadth. For example, if a rectangle has a length of 8 cm and a breadth of 5 cm, then its area is 8 × 5 = 40 cm². This formula is fundamental and widely used in various practical situations like flooring, painting walls, and fabric cutting. Understanding the concept of area also helps in solving problems involving land measurement and construction. The area remains the same regardless of the orientation of the rectangle. This section also explains how to measure length and breadth accurately using a ruler or measuring tape before calculating the area.

📊 Diagram: The diagram shows a rectangle with length labeled as 'l' and breadth as 'b'. The rectangle is divided into small unit squares to visually demonstrate how area is calculated by counting these squares.

🧪 Activity: Activity: Students measure the length and breadth of their notebook covers and calculate the area using the formula.

🔗 Connection: Leads to the next section on the area of squares and how it relates to the area of rectangles.