What is the purpose of a pie chart and when do you use one?

A pie chart can be used for visualizing data and you can use one for percentage results such as; your classmates like blue and some like green and some like purple, you could use a pie chart to find the percent of classmates that like each color by collecting data by asking what their favorite color is. Then you can put the data into the pie chart to see how many people like a certain color.

Math and science. You use a pie chart to compare how much you have of something I think

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

Using the rise/run rule. you would get 2/6.simp. 1/3