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Year 9 Interactive Maths - Second Edition


Perimeter

Recall that:

Perimeter is the distance around a closed figure.

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


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






Perimeter of a Square

Recall that:

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

P = 4s

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


Example 1

Find the perimeter of a square paddock of side 35 m.

Solution:

So, the perimeter is 140 m.


Perimeter of a Rectangle

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

P = 2(l + w)

where l is the length and w is the width of the rectangle.


Example 2

Find the perimeter of a rectangular field of length 50 m and width 40 m.

Solution:

So, the perimeter is 180 m.


Perimeter of a Triangle

The perimeter, P, of a triangle is given by the formula:

P = a + b + c

where a, b and c are the side lengths of the triangle.

 

Example 3

Find the perimeter, P, of the triangle shown.

Solution:

So, the perimeter is 24 cm.


Key Terms

perimeter


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