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Covered Area Number of Square Boxes Area (in sq. cm)
Completely filled squares 9 1 × 9 = 9

1
Half-filled squares 0 × 0 = 0
2

More than half-filled squares 12 1 × 12 = 12
Less than half-filled squares 4 0 × 4 = 0
Total Area = 9 + 12 = 21 square cm

Thus, the area of the given figure is 21 sq. cm.
Area of a rectangle

Let us consider a rectangle whose length is 6 cm and breadth is 4 cm.

6 cm 6 cm

4 cm 4 cm

1 cm
1 cm

Now, divide it into squares whose side is 1 cm.
Count the number of squares in the rectangle.

Here, number of squares = 24.
Area of the rectangle = Area of 24 squares Tips

= 24 sq. cm
= (6 × 4) sq. cm The length and breadth

Area of a rectangle = (Length × Breadth) sq. units must have the same unit.

That is, A = (l × b) sq. units

A A
It also follows that, l = units and b = units.
b l
example 3. Find the area of a postcard whose length
is 12 cm and breadth is 8 cm.

Solution. Here, length of the postcard = 12 cm 8 cm

and breadth of the postcard = 8 cm
Area of the postcard = Length × Breadth

= 12 cm × 8 cm 12 cm

= 96 sq. cm

196 Mathematics 5