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Year 7 Interactive Maths - Second Edition


Perimeter

The perimeter, P, is the distance around a closed plane figure.

Perimeter can be measured in millimetres (mm), centimetres (cm), metres (m) and kilometres (km).  These units are related as follows:

10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km


Perimeters of the following figures are often required to solve real world problems.

A square, rectangle and triangle.


Perimeter of a Square

The perimeter, P, of a square is given by the formula

P = 4s

where s is the length of any side of the square.

Square

Note:

The rule (or equation)

P = 4s

represents the relationship between the length of a side of a square and the perimeter.  Such an equation, which gives a rule for working out the value of one quantity from the values of others, is called a formula.


Example 9

Find the perimeter of a square paddock of side 25 m.

Solution:

P = 100

So, the perimeter is 100 m.

Square of side-length 25 m

Key Terms

perimeter, square, side-length, formula


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