Wolfram Research
Wolfram Math World: Pie Chart
This page briefly discusses the use of pie charts (or circle graphs) in representing data. Provides detailed information for understanding.
National Council of Teachers of Mathematics
Nctm: Illuminations: Circle Grapher
A computer applet that will draw any circle graph with student's data input.
Sophia Learning
Sophia: What Are Pie Charts?
This lesson defines the phrase pie chart. Students can look at a presentation and then take an online quiz.
