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HomeSoftware TutorialComputer SoftwareTutorial on making Venn diagrams using Geometric Sketchpad

Drawing Venn diagrams using Geometry Sketchpad is a common math task. A Venn diagram is a visual tool used to represent relationships between sets. Many beginners may encounter difficulties in drawing Venn diagrams. Therefore, PHP editor Apple will introduce in detail the steps to use Geometric Sketchpad to create Venn diagrams. Read on to learn how to draw a Venn diagram and master related techniques.

Open the geometric sketchpad, click the [Circle Tool] on the left toolbar, and draw a circle of appropriate size. Then under the [Edit] menu, copy this circle and paste it twice; select the [Move Arrow Tool] at the top of the left toolbar, adjust the three circles to the appropriate positions as shown in the picture, and place them in the three circles respectively. Click on the intersection point, and three intersection points will appear (as shown in the picture, that is, which part you want to shade, just click on the intersection point of the part first to visually display the shaded area).

Tutorial on making Venn diagrams using Geometric Sketchpad

Select the [Point Tool] on the left, and point dense points on the line between the three intersection points. Please be sure to point on the curve, otherwise the shadow will be irregular. , when the mouse points to the line, the line turns red, which means you can click on the line. The degree of density determines the completeness of the shaded part within the curve. The appropriate amount is sufficient, otherwise it will increase the workload of subsequent selections.

Tutorial on making Venn diagrams using Geometric Sketchpad

Select the [Move Arrow Tool] on the left and select the points above one by one from the selected points. Please note: it must be done one by one, otherwise the shadow area will be irregular. In the geometric sketchpad, the selected part is displayed in purple by default. Click the [Polygon Interior] command under the [Construction] menu to construct the shadow. Right-click on the shadow and select [Color] to modify the color.

Tutorial on making Venn diagrams using Geometric Sketchpad

Now that the shadow has been added, the next step is to eliminate these redundant points. Select the points in the geometric sketchpad, right-click and select [Hide] to disappear, but the operation is more troublesome. The method of batch hiding is: press CTRL+A, select all objects, then select [Move and Arrow Tool], and Invert the selection of the parts that do not need to be hidden (note: you do not need to press CTRL to select multiple units in the geometric sketchpad). What we need to retain are the three circles and the shadow, and then select the [Hide Points] command under the [Show] menu.

Tutorial on making Venn diagrams using Geometric Sketchpad

Select the [Text Tool] on the left toolbar, add text at the appropriate position, and select the [Move and Arrow Tool] to adjust the text to the appropriate position. Finally, press CTRL+A to select all, right-click to copy, paste where you need to use it and adjust the size.

Tutorial on making Venn diagrams using Geometric Sketchpad

Tips:

When it comes to doing two partial shadows, please do it separately. One is to prevent the wrong selection when selecting points and having to redo them. The other is Multiple points in sequence will create confusing shadows.

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