Page 108 - Mathematics_Std_4

In Activity 2 you have learnt that the area of a triangle is obtained
by counting small squares. That is the area of a triangle is obtained
by taking half of the area of the square or rectangle.
1
Therefore, the area of a triangle = × × height base.
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2

Example 1

Find the area of the triangle PQR.

P

7 cm

Q 10 cm R

Solution

Base (QR ) = 10 cm

Height (QP ) = 7 cm

1
Area of a =triangle × × height base
2

1
= × ×10 cm 7cm
2
= 35 cm 2

2
Therefore, the area of a triangle PQR is 35 cm .

101

06/11/2024 17:17:24
MATHEMATICS STD 4 PB 2024.indd 101 06/11/2024 17:17:24
MATHEMATICS STD 4 PB 2024.indd 101