## GeoGebra Tutorial 28 – Animation and Hypocycloids

This is the 28th tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, you might want to read the GeoGebra Essentials Series.

A hypocycloid is a special curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. It is comparable to the cycloid but instead of the circle rolling along a line, it rolls within a circle.

In the tutorial below, menu commands, located in the menu bar, are in green bold text, and sub-menus are denoted by the > symbol. For example, Options>Labeling> New Points Only means, click the Options menu, choose Labeling from the list, then select New Points Only. The tool texts are colored orange. For example, New Point means the new point tool. Texts typed in the input box are colored blue. » Read more

## GeoGebra Essentials 9 – Texts and Variables

This is the eighth tutorial in the GeoGebra Essentials Series. If you are not familiar with GeoGebra, you may want to read the Introduction to GeoGebra post and the earlier tutorials in this series.

In the tutorial below, menu commands, located in the menu bar, are in brown bold text, and submenus are denoted by the > symbol. For example, Options>Labeling> New Points Only means, click the Options menu, choose Labeling from the list, then select New Points Only. The name of the tools are colored orange. For example, New Point means the new point tool.

In this tutorial, we  learn how to use the Text tool of GeoGebra. We will use a previous tutorial on how to use sliders, and then, learn how to the text tool and how concatenate text and variables. The output of this tutorial can be viewed here.

In doing the tutorial, we are going to learn the following:

• Understand the difference between text and variables in GeoGebra
• Concatenate text and variables  » Read more

## Advanced GeoGebra Tutorial 4 – Constructing a Customized Tool I

If we want to create a mathematical object (not included in the toolbar) many times, we may want to create our own tool.  This will save us the trouble of creating similar mathematical objects repeatedly.  In this example, we are going to create our own tool – the circumcircle of any triangle.  A circumcircle is a circle that passes through the three vertices of any triangle.

First we will construct a circumcircle of a triangle, and then we will use it to construct our customized tool. » Read more

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