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The perimeter of a triangle
The perimeter of a triangle is the sum of the lengths of its three
sides. Thus, the perimeter of a triangle is obtained by adding the
lengths of its sides.
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Example 1
Find the perimeter of the following triangle.
7 cm
6 cm
9 cm
Solution
Perimeter of a triangle = sum of the lengths of all sides
= 6 cm + 7 cm + 9 cm
= 22 cm
Therefore, the perimeter of the triangle is 22 cm.
Example 2
A triangle has sides measuring 14 metres, 16 metres and
11 metres. Find its perimeter.
Solution
Perimeter of a triangle = sum of the lengths of all sides
= +14 m + 16 m 11 m
= 41 m
Therefore, the perimeter of the triangle is 41 m.
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MATHEMATICS STD 4 PB 2024.indd 85 06/11/2024 17:17:18
MATHEMATICS STD 4 PB 2024.indd 85
