How to Create a Venn Diagram - PDF by bbu87850

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									                           How to Create a Venn Diagram

Skills for this tutorial
In mathmatics, calculations and reasonings can be clarified by using various
kinds of drawings and diagrams. In set theory, the Venn Diagram is commonly
used. In these diagrams, the universal set is represented by a rectangle, and the
other sets of interest within the universal set are depicted by oval regions-usually
circles.

Let’s get started
TIP: You will find it easier to first draw the Venn Diagram out on paper and use
MathGV to just redraw the final diagram for use in the class.


To create a Venn Diagram in MathGV involves utilizing the drawing options of the
software vs entering funtions and having the program plot your results.

To begin, select the New 2D Cartesian Graph button




from the main screen. That will bring up the following blank graph.
For the purposes of creating a Venn Diagram the x & y axis are not necessary
and can be deleted from your graph by selecting the Graph Settings from the
Graph pull down menu.




This will bring up a screen that will allow you to turn off the grid lines for the x & y
axis. The first screen that comes up click the boxes to remove the checks in the
x & y axis areas. This will create a clean slate for your Venn Diagram.
You are now ready to create your Venn Diagram.

Let’s create a Venn Diagram using the following information:

n(A) = 24, n(B) = 24, n(C) = 26, n(A ∩ B) = 10, n(B ∩ C) = 8, n(A ∩ C) = 15,
n(A ∩ B ∩ C) = 6, n(U) = 50

Start with your blank diagram screen and select the ellipse button. This will allow
you to add circles to your diagram.
You can add as many circles as necessary for your Venn Diagram. To set a
circle, just click on the screen and move your mouse around until the desired
location and size is achieved. It may take some practice to get them lined up
where you want them, but just keep trying and resetting the circles until achieving
your desired result.




Now continue to add circles as required to illustrate your Venn as determined by
the previous info. Here it is again for review:

n(A) = 24, n(B) = 24, n(C) = 26, n(A ∩ B) = 10, n(B ∩ C) = 8, n(A ∩ C) = 15,
n(A ∩ B ∩ C) = 6, n(U) = 50

This Venn will require 3 circles. A rectangle has been added around the area to
show the Universal set area.
All that is left to do is label the appropriate intersections and areas of your Venn
Diagram.

To do this all you need to do is select the Text button




from the toolbar and then select your spot to begin typing with your cursor and
enter your labels.
Continue the same process to fill in the rest of your information and Viola! the
completed Venn is below.
If desired, color can easily be added to your diagram by using the Flood Fill
button.




From there just select your desired color and click on the area you wish to fill and
it will fill in the area.
Here are some other examples of using color.
If you make a mistake along the way many items can be deleted by just moving
the cursor around or clicking on another part of the screen. However, this will not
work in every instance and sometimes you will just need to start over with a new
graph. Sometimes you can delete an action from the pull down label menu.
Below are some options of changing editing labels.




After you are happy with your diagram all that is left to do is save your graph.

								
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