Pie Charts

 

Pie charts are drawn as sections of a circle.

 

eg. The size of each section shows the number of things happening

The bigger the angle, the more things have been counted

 

eg. Pie chart to show Games Options

 

             Most people do rugby

                                    Less do soccer

                                    Least do swimming

 

As each circle is .  If the angles are given (or can be found using a protractor), the individual numbers can be found.

 

1.       Divide the total by  to find how many for  

2.       Multiply by the angle

eg. If 60 people did Games in total and the angles are:

            Rugby               =  

            Soccer              =  

            Swimming         =  

 

then

Rugby               =  people

 

Soccer              =  people

 

Swimming         =  people

 

(check 30 + 20 + 10 = 60 people!)

 

Drawing Pie Charts

 

To draw a pie chart you must find how many degrees are needed for each section.  This can be done by:

 

1.       Add the amounts to find the total

2.       Divide  by the total and multiply by the amount

 

 

eg.        20 people like History

            40 people like Geography

            50 people like PE

            90 people like Maths

 

1.  Total            = 20 + 40 + 50 + 90

                        = 200 people

 

2.  for    History              =           

Geography        =  

           

PE                    =  

           

Maths               =  

 

Then draw a large circle using your compass and measure the exact angles using your protractor.