If your comment is in reference to Excel, both types of charts are just as easy to calculate.
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Causes of Water in a pie chart should be shown because its easier to understand the causes of water problems in a pie charts rather than a bar graph b'coz studying a pie chart is easy b'coz the percentages of the information is given rather than studying numbers in a bar graph and now a days in the world when we make a projets where pie chart is included its very to study that information ( of that projet :p) .
A bar graph IS a chart.A bar graph IS a chart.A bar graph IS a chart.A bar graph IS a chart.
One advantage of a bar chart is that it is able to make trends more obvious than a table chart. Another advantage is that you're easily able to estimate key values.
bar graph
The advantage is: You can see the data clearer and is easier to draw. It helps if you use numbers that have NOT got percentages in. The disadvantage is: If you have no choice but to use a bar chart with percentages, you'll have a difficult time trying to do it. A Pie Chart is better to use. I hope it helps. I'm only 12 years old.