Use area and perimeter to determine cost

Key Notes :

📏 Perimeter

The perimeter is the distance around the boundary of a shape.

Formula examples:

• Rectangle: P = 2 × (Length + Width)
• Square: P = 4 × Side

💰 Use: Helpful to calculate fencing or border cost.

Example: Fencing a garden costs ₹50 per meter.

• Perimeter × Cost per meter = Total cost

📐 Area

The area is the space inside a shape.

Formula examples:

• Rectangle: A = Length × Width
• Square: A = Side × Side

💰 Use: Helpful to calculate painting, flooring, or tiling cost.

Example: Flooring a room costs ₹100 per m².

• Area × Cost per m² = Total cost

🔢 Step-by-Step Method to Find Cost

• Measure or find the length and width of the shape.
• Calculate perimeter if needed for fencing.
• Calculate area if needed for flooring, painting, or tiling.
• Multiply perimeter or area by the cost per unit.
• 🎯 Result: Total cost!

🖼️ Examples:

Fencing a rectangular garden:

• Length = 10 m, Width = 5 m
• Perimeter = 2 × (10 + 5) = 30 m
• Cost = 30 × ₹50 = ₹1500

Flooring a square room:

• Side = 4 m
• Area = 4 × 4 = 16 m²
• Cost = 16 × ₹100 = ₹1600

💡 Tips & Tricks:

• Always check the unit (meter, cm, m²).
• Perimeter → cost of edges/fencing
• Area → cost of inside space (floor, paint, tiles)
• Draw a diagram to avoid mistakes 🖊️

🎨 Fun Emoji Summary:

• 🌳 Garden fencing → Perimeter
• 🏠 Floor or wall tiles → Area
• 💵 Multiply by unit cost → Total cost

Learn with an example

Let’s practice!🖊️