How to Make a Pi Graph
A pi graph is a way to use pi as a function. Pi rounds off to 3.14, and is an important mathematical principle, especially in circles. A pi graph uses circumference for the y-axis and diameter for the x-axis. Because circumference divided by diameter equals pi, then at any point on the graph if you divided the circumference from the y-axis by the diameter on the x-axis you will always calculate pi.
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Instructions
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Set up your graph with circumference as the y-axis, the vertical axis, and diameter as the x-axis, the horizontal axis.
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Draw a circle and measure its length. This is your circumference. For example, assume the circumference is 6.28 inches.
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Measure from one side of the circle to the other. This is the diameter. In the example, the diameter equals 2, or the circumference divided by pi to the nearest whole number.
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Plot the circle's circumference and diameter on the graph. Mark 2 inches on the horizontal axis and then go up to where 6.28 inches falls on the y-axis. Notice, 6.28 divided by 2 equals 3.14, or pi.
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Repeat the above steps with as many circles as necessary to complete the graph, depending on the number of variables you wish to plot.
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Connect the plots on your graph to show the mathematical constant of the ratio of any circle's circumference to its diameter.
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