## GeoGebra Essentials 4 – Angles, Lengths and Object Properties

This is the fourth tutorial in the** GeoGebra Essentials Series**. If you are not familiar with GeoGebra, you may want to read the **Introduction to GeoGebra **post and earlier GeoGebra tutorials in this series. It contains the pre-requisite materials for this tutorial.

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 GeoGebra tools are denoted by **orange texts**. For example, **New Point** means the new point tool.

In this tutorial, we use GeoGebra to investigate the relationship between the interior angles of a triangle and the lengths of its sides. We also learn two new tools – the *Angle *and the *Distance or Length *tool. In addition, we discuss how to change the basic properties (color, width, and style) of mathematical objects. The output of our tutorial is shown above. » Read more