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Chapter Five
Perimeters of plane figures
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Introduction
In this chapter, you will learn to find the perimeter of a
rectangle, square and triangle. You will also learn to solve
problems involving the concept of perimeters of plane figures.
The competencies developed will be applied in building
constructions, estimating of distances covered and many other
real-life applications.
Think
Mathematics without figures
Concept of perimeter
A perimeter is the length of the boundaries of a plane figure.
Different ways are used to find the perimeter of a rectangle,
square and triangle. The perimeter can be expressed in various
metric units of length.
The perimeter of a rectangle
The perimeter of a rectangle is the sum of the lengths of its sides.
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