Pie Charts Be able to construct a pie chart from a collection of data, using a protractor.

Makes of car in a school car park MakeCavalierFordRoverVolvo Frequency3241 Construct a pie chart to show this information. A full circle is 360 o There are a total of = 10 cars We use 36 o to represent each car because we need to share 360 o between 10 cars 360 o

Makes of car in a school car park MakeCavalierFordRoverVolvo Frequency3241 Angle in pie chart We use 36 o to represent each car so the 3 Cavaliers are represented by 3x36 o = 108 o Work out the angle needed for each of the other models of car 3x36 o =108 o 2x36 o =72 o 4x36 o =144 o 1x36 o =36 o

Makes of car in a school car park MakeCavalierFordRoverVolvo Angle108 o 72 o 144 o 36 o Mark the centre of the pie chart and draw the circle. Draw a line from the centre to the edge Measure the first angle needed (108 o ) Draw in the line and label the section 108 o Cavalier

Makes of car in a school car park MakeCavalierFordRoverVolvo Angle108 o 72 o 144 o 36 o From this line measure the next angle, draw the line and label the section. Continue in this way Check that the last section has the correct angle and label it. 72 o Cavalier Ford 144 o Rover 36 o Volvo

Why? Why do we use 36 o to represent 1 car? What would happen if there were 20 cars? What about 60 cars? Or 15 cars? Size of angle for 1 car =

Work out the missing numbers on this number spider ÷ 30cars ÷ 12 cars ÷ 24 cars ÷ 20 cars ÷ 10 cars ÷ 15 cars ÷ 90 cars ÷ 4 cars Size of angle for 1 car =

Interpreting Pie Charts 20 pupils in class 3B travel to school. From the chart find the number of pupils who travel by each method. Walk = Cycle = Bus = Find the fraction of a circle and multiply by the total number of pupils

180 boys in year 5 chose their favourite sport. From the chart find how many chose each sport. Sports: Football: 72, Rugby 40, Hockey 30 Cross Country 20, Squash 18.

300 passengers boarded a train in London. From the chart find how many are travelling to each destination. Passengers: Southampton 100, Bournemouth 75, Poole 50, Branksome 45, Parkstone 30.

150 packets of crisps were sold from a vending machine. From the chart find the number for each flavour. Find also the percentage for each. Crisps: Plain 60, Cheese & Onion 45, Salt & Vinegar 30, Prawn Cocktail 15