Page 97 - Mathematics_Std_4

5. The sides of a triangular pizza are 36 cm, 9 cm and 27 cm

long. Find the perimeter of the pizza.
6. A businessman sold a carpet that is 12 metres long and
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8 metres wide. Find its perimeter.

7. The length of one side of a triangular pool is 40 metres.
If the lengths of the sides of the pool are equal, find its

perimeter.

8. A field has a length of 65 metres and a width of 40 metres.
Find its perimeter.

Activity 2 Recognising perimeters of plane figures
using reliable ICT resources

Description

Use online programs and computer packages such as

GeoGebra and Khan Academy to learn more on perimeters of
plane figures and their applications.

Summary

1. Perimeter is the length of the boundary of a plane figure.

2. Perimeter of a rectangle = × 2 length + × 2 width.

3. Perimeter of a square = ×4 length.

4. Perimeter of a triangle = The sum of the lengths of all
sides.

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MATHEMATICS STD 4 PB 2024.indd 90
MATHEMATICS STD 4 PB 2024.indd 90 06/11/2024 17:17:20