bar diagram and pie diagram
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A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. Wikipedia
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To draw a pie chart, we need to represent each part of the data as a proportion of 360, because there are 360 degrees in a circle. For example, if 55 out of 270 vehicles are vans, we will represent this on the circle as a segment with an angle of: (55/270) x 360 = 73 degrees.
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A bar diagram is used to compare many things between various groups. It is also used to track changes over a period of time.
Anyway, when we try to see changes over a period of time, bar graphs may be the best when the happening changes are bigger in nature.
Comparatively, a pie chart is best for using while trying to compare different parts of a complete aspect. It does not show all the changes that happen over time.
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