Graph theory is the study of graphs:mathematical structures used to model pairwise relations between objects from a certain collection.A "graph" in this context refers to collection of edges that connect pairs of vertices.While computer graphics are graphics created using computers and more generally,the representation of image data by computer......
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The difference between a graph and a diagram is as follows: a diagram is a chart which shows a drawing and a graph is a graph with lines or bars indicating something specific in numbers.
a picture graph is an actual picture of the item being graphed and a picto graph is a symbol of the item being graphed
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pictographs have pictures bar graphs have bars
pictograph is a visual representation of numeric data; all the quantity would be represented in this graph. where as a picturegraph is a graph showing comparision of quantities with the help of a picture for ex. bar chart, pie etc.