Unit 14 Section 1 : Coordinates

You will have used coordinates before. In this section, we revisit coordinates before starting work on lines and graphs.
Remember that the first number is the x-coordinate (right) and the second number is the y-coordinate (up).

The origin is the centre of the graph at ( 0 , 0 ).
If the x-coordinate is a negative number then the point will be to the left of the origin.
If the y-coordinate is a negative number then the point will be below the origin.

Practice Question

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

to see whether you are correct.

Look at the coordinate grid below.

What are the coordinates of A?

What are the coordinates of B?

What are the coordinates of C?

What are the coordinates of D?

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.

NOTE: In the next few questions you need to plot points and draw lines on graphs.
To plot a point, just click on the graph with your left mouse button. To draw a line,
hold down the left mouse button at one end of the line and drag the pointer to the
other end of the line. When you let go of the button the line will appear.

If you make a mistake, press the delete key and the graph will be cleared.

Question 2
(a) Plot these points on the graph below and join them up with straight lines to form a triangle:
( 3 , –2 ) , ( –1 , 6 ) and ( –5 , –2 )

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

Question 3
(a) Plot these points on the graph below and join them up in order to form a shape:
( –1 , 4 ) , ( 2 , 5 ) , ( 5 , 4 ) and ( 2 , –1 )

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

Question 5
The coordinates of 3 corners of a rectangle are:
                ( –1 , 6 ), ( –4 , 6 ) and ( –4 , –5 ).
What are the coordinates of the other corner?
( , )
You may find it helpful to use the graph on the right.
Only the answer above will be marked.

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

Question 6
A shape has corners at the points with coordinates:
                ( 3 , –2 ) , ( 6 , 2 ) , ( –2 , 2 ) and ( –5 , –2 ).

(a) Plot the points on the graph below and join them in order.

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

Question 7
A shape has corners at the points with coordinates:
( 3 , 3 ) , ( 1, –1 ) , ( 3 , –5 ) and ( 5 , –1 ).

(a) Plot the points on the graph below and join them in order.

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

Question 8
(a) Plot the coordinates below, joining them in order, to form a polygon:
( –5, 0 ) , ( –3 , 2 ) , ( –1 , 2 ) , ( 1 , 0 ),
( 1 , –2 ) , ( –1 , –4 ) , ( –3 , –4 ) and ( –5 , –2 ).

You need to upgrade your Flash Player
Go to http://www.adobe.com/go/getflashplayer.

You have now completed Unit 14 Section 1

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 May 2008