Unit 9 Section 2 : Area and Perimeter of a Square

In this section we bring in standard units for measuring area and perimeter.
From now on you should always put units in your answers.

The area of a square with sides of length 1cm is 1cm².

The area of other squares can be found by counting squares or by multiplying the length of the sides.

The perimeter of a square is the total length of the four sides.

Example Question

Look at the 7cm × 7cm square below:

Practice Questions
Work out the answer to each of these questions then click on the button marked

to see whether you are correct.

(a) What is the area of the square?

(b) What is the perimeter of the square?

NOTE: The area is given in cm² but the perimeter is given in cm because it is a length.

Different Length Units

We also measure in metres (m) and millimetres (mm). These are converted as follows:

To convert from cm to mm we multiply by 10. To convert from mm to cm we divide by 10.
To convert from cm to m we divide by 100. To convert from m to cm we multiply by 100.
For example:

Exercises

Work out the answers to the questions below and fill in the boxes. Click on the

button to find out whether you have answered correctly. If you are right then

will appear and you should move on to the next question. If

appears then your answer is wrong. Click on

to clear your original answer and have another go. If you can't work out the right answer then click on

to see the answer.

Question 1
Work out the area and perimeter of each of the squares below.
Each square on the grid is 1cm by 1cm.

Question 2
Answer the questions below.

Question 3
Answer the questions below.

Question 4
Below are some conversions between metres, centimetres and millimetres. Fill in the gaps.

Question 5
A square has sides of length 20mm.

Question 6
The perimeter of a square is 40 cm.

Question 7
The area of a square is 36 cm².

Question 8
The perimeter of a square is 44 cm.

Question 9
The area of a square is 144 cm².

You have now completed Unit 9 Section 2

Your overall score for this section is

Correct Answers
You answered questions correctly out of the questions in this section.

Incorrect Answers
There were questions where you used the Tell Me button.
There were questions with wrong answers.
There were questions you didn't attempt.

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Produced by A.J.Reynolds January 2001

(a)	Area = cm² Perimeter = cm
(b)	Area = cm² Perimeter = cm
(c)	Area = cm² Perimeter = cm