The Tools menu let us create and manage new tools via a simple wizard, a great extra. We could also customize much of the program's look and functions on the Options menu. We entered some simple equations in the Input field, and GeoGebra displayed them in the main view. As we moved the cursor around for the third point, the circle moved position, expanded, and contracted to follow, with the changing value displayed in the Free Objects list in the left-hand navigation console as well as in small parentheses next to the cursor. We added the first two points, which drew the circle. For example, we clicked the tool to add a Circle Through Three Points. Once we'd placed an object, we could easily move it around. As we clicked to add points or other objects, the program added them to either the Free Objects or Dependent Objects lists. Clicking any object and then clicking on the main two-axis view opened small properties boxes that let us customize and configure each item. GeoGebra's default interface displays a toolbar full of unique icons for adding a range of objects, including Points, Lines Through Two Points, Polygons, Ellipses, Angles, Reflect Objects, and Sliders. It requires the Java Runtime Environment. It's available in many languages and is supported by a community of users and developers as well as a useful Web-based Help file, a forum, and a wiki. It can create points, vectors, lines, segments, conic sections, and more using preconfigured tools and handle variables for vectors, numbers, and points. It combines a flexible, easy-to-use geometry tool with direct input of equations and coordinates. GeoGebra, the free, open-source mathematics software is designed for math classrooms in secondary schools, but anyone who uses geometry, algebra, or calculus should check it out.
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