Quest of Nine

The Book

Make a pie chart

Pie charts are not easy to construct on paper. This pie chart maker will create a pie chart from a tally table.

When you have collected your data, give your pie chart a title and select the number of slices it will have.
Fill in the tally table and click on 'Make the pie chart'.

How many slices?

Make a pie chart using a protractor

A pie chart displays what fraction of the whole data set is covered by each slice

E.g. to make a pie chart from a data-set of favorite pets

Cat - 5
Dog - 9
Hamster - 4
Gerbil - 2

1. Get the total 5 + 9 + 4 + 2 = 20

2. Get the fraction of the total for each slice

Cat - 5 ÷ 20 (say 5 out of 20)
Dog - 9 ÷ 20 say 9 out of 20)
Hamster - 4 ÷ 20 (say 4 out of 20)
Gerbil - 2 ÷ 20 (say 2 out of 20)

3. There are 360o in a circle. So you need to multiply the fractions you got by 360 to work out the angle for each slice.

Cat - (5 ÷ 20) x 360 = 90o
Dog - (9 ÷ 20) x 360 = 162o
Hamster - (4 ÷ 20) x 360 = 72o
Gerbil - (2 ÷ 20) x 360 = 36o
degrees in a circle