Reading pie graphs (circle graphs) : Khan Academy on a Stick

Khan Academy on a Stick

Reading and interpreting data

Stem-and-leaf plots
Reading stem and leaf plots
Reading pictographs
Reading bar graphs
Histograms
Reading bar charts: basic example
Creating a bar chart
Reading bar charts: comparing two sets of data
Reading bar charts: putting it together with central tendency
Reading line graphs
Reading pie graphs (circle graphs)
Misleading line graphs

If the above player doesn't work, try this direct link.