difference b/w frequency polygon and histogram

Histograms are two dimensional diagrams that depict the frequency distribution of a continuos series by the means of rectangles. The width and height of the rectangles determine the class intervals and class frequency respectively.  

On the other hand, a frequency polygon is a closed figure that is formed by joining top midpoints of all the rectangles of histograms using a straight line. It can also be created without the help of the histograms, wherein the midpoints of class intervals are directly plotted and are joined by a straight line.

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