Graphs - 14065

Figure 2-13. A rectangular coordinate graph.

Illustrator Draftsman 3 & 2 - Volume 4 Presentation Graphics
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Graphs Introduction Graphs are a graphic representation of quantitative data such as a table or chart. A graph, or chart, conveys information, data, and statistics for comparison, analysis, and prediction. Graphs are easier to understand than a table of text and figures. The graphs covered in this segment are rectangular coordinate graphs, bar graphs, line graphs, percentage bar graphs, and pie charts. Rectangular coordinate graphs Rectangular coordinate graphs show the relationship between two or more variables. You can plot a large number of points and compare their related curves to show overall trends as opposed to absolute quantities. These points or coordinates reflect quantities in relation to a given reference frame. Reference frame y- axis and x-axis is the coordinate 0, (0,0), or origin. This intersection creates four quadrants, numbered counterclockwise I, II, III, and IV. The following table lists the value of each quadrant: A reference frame of a rectangular coordinate graph is a vertical and a horizontal line that intersect at a 90-degree angle. The vertical line is the y-axis and the horizontal line is the x-axis. The point of intersection of the Quadrant Value Quadrant I Positive values along each axis. Quadrant II Negative x-axis values, positive y-axis values. Quadrant III Negative values along each axis. Quadrant VI Positive x-axis values, negative y-axis values. Continued on next page 2-18

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