📏 Two Different Measurements
Perimeter is the distance AROUND a shape (like walking around a field). Area is the space INSIDE a shape (like how much carpet to cover a floor).
🔑 Remember the Difference
Perimeter vs Area
- 📍 Perimeter = distance around = measured in units (cm, m)
- 📐 Area = space inside = measured in square units (cm², m²)
Think: Perimeter = fence around a garden. Area = grass inside the garden.
📝 Key Formulas
⬜
Rectangle
Perimeter = 2(l + w)
Area = l × w
🔳
Square
Perimeter = 4s
Area = s²
🔺
Triangle
Perimeter = a + b + c
Area = ½ × b × h
⚪
Circumference = 2πr
Area = πr²
💡 Worked Example
Rectangle: 5m × 3m
Perimeter: 2(5 + 3) = 2 × 8 = 16m
Area: 5 × 3 = 15m²
Circle: radius = 7cm (use π ≈ 3.14)
Circumference: 2 × 3.14 × 7 = 43.96cm
Area: 3.14 × 7² = 3.14 × 49 = 153.86cm²
✏️ Activities
Calculate These
- Rectangle: 8cm × 4cm
- Perimeter = ___cm
- Area = ___cm²
- Square: side = 6m
- Perimeter = ___m
- Area = ___m²
- Triangle: base = 10cm, height = 8cm
- Area = ___cm²
My working:
👩🏫 Teacher Notes
Curriculum Links
- Mathematics: Geometry & Measurement