Page 155 - Math Skill - 4

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Thus, area of the square = 9 sq cm = 3 × 3 sq cm

= side of the square × side of the square 3 squares
Thus, Area of a square = side × side

3 squares
Fact-o-meter
Absorbing Facts
� Perimeter of a rectangle = 2 (length + breadth) Perimeter Vs Area
� Perimeter of a square = 4 × side When you are standing in a park

� Area of a rectangle = length × breadth then the length of its boundary
represents the perimeter while the
� Area of a square = side × side inside space of park represents the
2
2
� The unit of area are sq. cm or cm and sq. m or m .
area of this park.

Let’s Attempt

Example 1: Count the unit squares in the figure below and then write its area in sq cm.

(Area of each unit square = 1 sq cm)
Solution: In the given figure, there are 18 unit squares.

Thus, area of this figure = 18 sq cm.
Example 2: Find the area of a rectangle whose length is 8 cm and breadth is 6 cm.
Solution: length = 8 cm, breadth = 6 cm

Area of the rectangle = length × breadth = 8 × 6 sq cm = 48 sq cm
Thus, area of the rectangle is 48 sq cm.

Example 3: Find the area of a square whose side is 32 cm.
Solution: Side of the square = 32 cm
Area of the square = side × side = (32 × 32) sq cm = 1024 sq cm

So, area of the square is 1024 sq cm.

Exercise 11.2

1. Find the area of a rectangle whose:
(a) Length = 26 cm, breadth = 4 cm (b) Length = 28 cm, breadth = 10 cm

2. By counting the unit squares, find the area of the following figures.
(Area of each unit square = 1 sq cm)

(a) (b) (c)

Area = ______ sq cm Area = ______ sq cm Area = ______ sq cm