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Graph Theory is a relatively new area of mathematics, first studied by the super famous mathematician Leonhard Euler in 1735. Since then it has blossomed in to a powerful tool used in nearly every branch of science and is currently an active area of mathematics research.

A poster showing the different parts of a graph. y-axis is the vertical axis. x-axis is the horizontal axis. Origin is the point where both the x-axis and y-axis are zero and intersect.

Learning Line Graphs The Title. The title offers a short explanation of what is in your graph. ... The Legend. The legend tells what each line represents. ... The Source. The source explains where you found the information that is in your graph. ... Y-Axis. In line graphs, the y-axis runs vertically (up and down). ... The Data. ... X-Axis.

The coordinate plane is divided into four equal parts by the intersection of the x-axis and the y-axis and are called quadrants.

William Playfair was a Scottish engineer credited with creating the line chart, bar chart, and pie chart.

The father of graph theory was the great Swiss mathematician Leonhard Euler, whose famous 1736 paper, "The Seven Bridges of Konigsberg," was the first treatise on the subject.

The founder of graphical methods of statistics, Playfair invented several types of diagrams: in 1786 the line, area and bar chart of economic data, and in 1801 the pie chart and circle graph, used to show part-whole relations.

The list of most commonly used graph types are as follows: Statistical Graphs (bar graph, pie graph, line graph, etc.) Exponential Graphs. Logarithmic Graphs. Trigonometric Graphs. Frequency Distribution Graph.

The paper written by Leonhard Euler on the Seven Bridges of Königsberg and published in 1736 is regarded as the first paper in the history of graph theory. This paper, as well as the one written by Vandermonde on the knight problem, carried on with the analysis situs initiated by Leibniz.