If you were talking about bar graphs,Then you would use them when you were graphing stuff.Like how much things like 97% Oceans 3% Fresh Water. You would put those things in a bar. I'm sorry if I am saying the wrong thing!
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bar charts and pie charts
you can use bar charts,histograms and pie charts to display your data....
Scatter plots, line graphs, pies and bar charts.
Bar graphs, pie charts, and even line graphs can all be used to compare. I personally like to use Bar graphs when showing numbers.
There are many kinds of charts you can make with numeric data. The most commons ones are bar charts, line charts, column charts and pie charts. There are many other specialised charts too. It depends on the kind of data you have and what you want to do with it.