The document discusses concepts of area and perimeter. It defines area as the size of a surface and perimeter as the distance around a shape. It provides formulas for calculating the area of rectangles and squares. For rectangles, the area is calculated by multiplying length by breadth. For squares, the area is calculated by squaring the length of a side. Several examples are provided to demonstrate calculating areas of different shapes using the appropriate formulas.

1. Measurement
Area
What will we learn today?
• concepts of area and perimeter of a
plane figure
• measurement of area in square units
• measurement of area in square
centimetres

2. What is Area?
Area is the size of a
surface.

3. Area of Simple Shapes
There are special formulas for certain shapes:
For example:
What is the area of this rectangle?
3cm
5cm

4. Area of Simple Shapes
There are special formulas for certain shapes:
For example:
What is the area of this rectangle?
Area = Length x Breadth
3cm
5cm

5. Area of Simple Shapes
What is the area of this rectangle?
Area = Length x Breadth
Length is the longest dimension of an object.
3cm
Length
5cm

6. Area of Simple Shapes
What is the area of this rectangle?
Area = Length x Breadth
Breadth is the extent or measure of how broad
or wide something is.
Breadth 3cm
5cm

7. Area of Simple Shapes
What is the area of this rectangle?
Area = Length x Breadth
Length is the longest dimension of an object.
Breadth is the extent or measure of how broad
or wide something is.
Breadth 3cm
Length
5cm

8. Area of Simple Shapes
Therefore, by applying the formula.
What is the area of this rectangle?
Area of rectangle = Length x Breadth
3cm
5cm

9. Area of Simple Shapes
Therefore, by applying the formula.
What is the area of this rectangle?
Area of rectangle = Length x Breadth
= 5cm x 3cm
3cm
5cm

10. Area of Simple Shapes
Therefore, by applying the formula.
What is the area of this rectangle?
Area of rectangle = Length x Breadth
= 5cm x 3cm
= 15 cm²
3cm
5cm

11. Area of Simple Shapes
Therefore, by applying the formula.
What is the area of this rectangle?
Area of rectangle = Length x Breadth
= 5cm x 3cm Notice the
= 15 cm² difference in units?
3cm
5cm

12. Area of Simple Shapes
Therefore, by applying the formula.
What is the area of this rectangle?
Area of rectangle = Length x Breadth
= 5cm x 3cm
= 15 cm²
The unit for AREA is cm² or m²

13. Summary
You can only find area when the length and
breadth have the same units.
For example,
the length is 5 cm and the breadth is 4 cm.
The area will be 20 cm².

14. Summary
You can only find area when the length and
breadth have the same units.
For example,
the length is 5 m and the breadth is 4 m.
The area will be 20m².

15. The area of Square T is 45cm² smaller than
the area of Square P.
Find the edge of Square Q.
P Q
Area = 81cm²

16. The area of Square T is 45cm² smaller than
the area of Square P.
Find the edge of Square Q.
P Q
Area = 81cm²
81 – 45 = 36 cm²

17. The area of Square T is 45cm² smaller than
the area of Square P.
Find the edge of Square Q.
6cm
P Q 6cm
Area = 81cm²
6 x 6 = 36 cm²

18. The area of Square T is 45cm² smaller than
the area of Square P.
Find the edge of Square Q.
6cm
P Q 6cm
Area = 81cm²
The edge of Square Q is 6cm.

19. The perimeter of a rectangular plot of land is 32m.
Its length is 9m.
Find its area.
9m
Area = ? cm² ?m
Step 1: Find the breadth.

20. The perimeter of a rectangular plot of land is 32m.
Its length is 9m.
Find its area.
9m
Area = ? cm² ?m
Step 1: Find the breadth.
32 - 9 – 9 = 14 m
14 ÷ 2 = 7 m

21. The perimeter of a rectangular plot of land is 32m.
Its length is 9m.
Find its area.
9m
Area = ? cm² 7m
Step 2: Find the area.
9 x 7 = 63m²

22. Are you ready to
try out the
questions?

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