Page 203 - Math_Genius_V1.0_C4_Flipbook

E:\Working\Focus_Learning\Math_Genius_4_(25-10-2023)\Open_Files\Chap-11
\\December 6, 2023 1:01 PM Bharat Arora P-6 Reader _________________________ Date: ___________________74

Thus, the amount of surface enclosed by a Remember
plane closed figure is called the area. We 1 cm square means a 1 cm

measure area in square units (sq. units) square of side 1 cm.
1 square cm means a 1 cm 1 cm
Area
If each unit square drawn on the Riya and Siya’s square that has area square = 1 sq cm
1 cm
drawing sheets has side of 1 cm, then we can equal to 1 square cm.
say that, the area of drawing sheet 1 = 28 sq. cm and the area of drawing sheet

2 = 24 sq. cm
1 cm
Hence, we can say that the area of a surface or a plane figure can be

calculated by counting the number of square units that needed to cover 1 cm
the surface or the plane figure.

example 1: Find the area of the following figures drawn on the squared paper by

counting squares. Consider each small square as 1 cm square.

(a) (b) (c)

Solution: (a) Number of unit squares in the figure = 15

Therefore, area of the figure = 15 sq. cm
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15

(b) Number of unit squares in the figure = 16

Therefore, area of the figure = 16 sq. cm 1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16

(c) Number of unit squares in the figure = 14 1 2 3

Therefore, area of the figure = 14 sq. cm 4 5 6
7 8 9 10
11 12 13 14

Mathematics-4 201