Page 109 - Mathematics_Std_4

Example 2

The height of a triangle is 15 metres. If its base is 30 metres,

find the area of the triangle.
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Solution
Height of a rectangle = 15m

Base of a rectangle = 30m

Area of a rect =angle 1 × × base height
2
1
= × × 30 m 15 m
2
= 225 m 2

Therefore, the area of the triangle is 225 m .
2

Example 3

Find the area of the triangle KLM.
L

12 cm

K 26 cm M
Solution

( )
Base KM = 26cm
( )
Height LN =12 cm
Area of the triang =le KLM 1 × × height base
2
1
= × × 12 cm 26 cm
2

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MATHEMATICS STD 4 PB 2024.indd 102 06/11/2024 17:17:25
MATHEMATICS STD 4 PB 2024.indd 102