NCERT Solutions For Class 6 Maths Chapter 10 Exercise 10.2
Ncert Solutions for Class 6 Maths Chapter 10 Mensuration Exercise 10.2:-
Exercise 10.2 Class 6 maths NCERT solutions Chapter 10 Mensuration pdf download:-
Ncert Solution for Class 6 Maths Chapter 10 Mensuration Exercise 10.2 Tips:-
Area:-
With the help of the squared paper, can we tell, what will be the area of a rectangle
whose length is 5 cm and breadth is 3 cm?
Draw the rectangle on a graph paper having 1 cm × 1 cm squares
(Fig 10.13). The rectangle covers 15 squares completely.
Fig 10.12
Covered Number Area
area estimate
(sq units)
(i) Fully-filled squares 1 11
(ii) Half-filled squares – –
(iii) More than
half-filled squares 7 7
(iv) Less than
half-filled squares 9 0
Total area = 1 + 7 = 8 sq units.
The area of the rectangle = 15 sq cm
which can be written as 5 × 3 sq cm i.e.
(length × breadth).
The measures of the sides
of some of the rectangles are
given. Find their areas by
placing them on a graph paper
and counting the number
of square.
What do we infer from this?
We find,
Area of a rectangle = (length × breadth)
Without using the graph paper, can we find the area
of a rectangle whose length is 6 cm and breadth is
4cm?
Yes, it is possible.
What do we infer from this?
We find that,
Area of the rectangle = length × breadth = 6 cm × 4 cm = 24 sq cm.
Area Of Square:-
Let us now consider a square of side 4 cm
What will be its area?
If we place it on a centimetre graph
paper, then what do we observe?
It covers 16 squares i.e. the area of the
square = 16 sq cm = 4 × 4 sq cm
Calculate areas of few squares by assuring
length of one side of squares by yourself.
Find their areas using graph papers.
What do we infer from this?
1. Find the area of
the floor of your
classroom.
2. Find the area of
any one door in
your house.
Length Breadth Area
3 cm 4 cm ———-
7 cm 5 cm ———-
5 cm 3 cm ———-
We find that in each case,
Area of the square = side × side
You may use this as a formula for doing problems.
What we have discussed?
Figures in which all sides and angles are equal are called regular closed figures.
The amount of surface enclosed by a closed figure is called its area.
To calculate the area of a figure using a squared paper, the following conventions
are adopted :
(a) Ignore portions of the area that are less than half a square.
(b) If more than half a square is in a region. Count it as one square.
(c) If exactly half the square is counted, take its area as
1
2 sq units.
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