about pie chart, bar graph
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Pie chart:
a type of graph in which a circle is divided into sector that each represent a proportion of the whole is known as pie chart.
Bar graph:
a diagram in which the numerical value of variables are represent by the height or lenght of lines or rectangles of equal width is known as bar graph
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In short, a pie chart can only be used if the sum of the individual parts add up to a meaningful whole, and is built for visualizing how each part contributes to that whole. Meanwhile, a bar chart can be used for a broader range of data types, not just for breaking down a whole into components.
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