Lesson 7 of 9
The big picture
Show on a big screenWalk the edge for perimeter. Count the squares for area.
| Idea | Remember | Example |
|---|---|---|
| Perimeter | Walk the edge, add it up. | 8+5+8+5 = 26 m |
| Shortcut | 2 × (length + breadth). | 2 × (7+4) = 22 cm |
| Area | Count unit squares, no gaps. | 20 cm² |
| Rectangle area | length × breadth, proven by tiling. | 7 × 6 = 42 cm² |
| Same rope | One rope, many areas. | 24 m rope: 36, 32, 20 m² |
| Odd shapes | Split into rectangles first. | L-shape: 12+8 = 20 m² |
Open Chapter 6, Perimeter and Area, in your NCERT book. You already measured both.