A pie chart is a type of graph used to show proportions close proportion A part-to-whole comparison. Where each part of a ratio is considered as a fraction of the whole. Eg, in the ratio 3 : 5 ...

Teacher Notes. This clip could be used to revisit fractions, decimals and percentages. A pie chart with some missing information could be used as a starting point, from which to calculate unknowns.

Arrow charts and slope charts are alternatives to multiple pie charts when the data consist of the values or the percentage breakdown of several categories for two time periods.