Perimeter and Area | Class 6 Mathematics Notes

Perimeter of a rectangle

A rectangle is a four-sided polygon with opposite sides equal and all angles right angles. To find the perimeter of a rectangle, we add the lengths of all four sides. Since opposite sides are equal, the perimeter can be simplified to twice the sum of the length and breadth. For example, consider a rectangle ABCD with length 12 cm and breadth 8 cm. The perimeter is calculated as AB + BC + CD + DA. Since AB = CD = 12 cm and BC = DA = 8 cm, the perimeter equals 2 × (length + breadth) = 2 × (12 cm + 8 cm) = 40 cm. This formula is efficient and widely used for calculating the perimeter of rectangles.

📊 Diagram: Reprint 2026-27

🧪 Activity: Measure length and breadth of rectangular objects and calculate their perimeters using the formula.

🔗 Connection: This section sets the foundation for perimeter formulas of other polygons like squares and triangles.