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 360^o 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 = 90^o

Dog - (9 ÷ 20) x 360 = 162^o

Hamster - (4 ÷ 20) x 360 = 72^o

Gerbil - (2 ÷ 20) x 360 = 36^o