Circle graphs, also known as pie charts, are a great way to display certain types of data. Since a circle graph is divided into sectors where each sector represents a proportion of the data set, we can get a sense of the data just by looking at it. Circle graphs are best used when trying to display data that are a percentage of the whole. That way we have the whole and can look at the different parts represented by sectors and easily see what part of the whole is represented by the percent.

You will most likely encounter circle graphs the most of all the charts due to the ease of reading them and their popularity.  In today's free 7th grade math video, Professor Edward Burger gives you several examples of circle graphs to give you a solid foundation in the subject. In the last of the three lectures, he shows how to decide what graph to use when displaying data. This is very important, as certain graphs will make it harder to read certain types of data.

So you can move through all three lectures on the video, don't forget to click on the forward button directly to the left of the time stamp to move to the next lecture!