GeoGebra Geometry

What GeoGebra Geometry is for

GeoGebra Geometry is a geometry app for building and exploring shapes on screen. The developer describes it as a tool for learning mathematics and science, and it is listed as free. The app is built around constructions: you place points, draw lines between them, and the shapes follow from those choices.

Students working through geometry topics are the obvious fit, since the developer frames the app around learning. Teachers and anyone checking a geometric idea by hand can use the same construction tools.

Building and dragging constructions

The basic objects are points, lines, circles, polygons and angles. You can construct triangles, draw parallel lines and intersect circles, which covers most of the standard compass-and-straightedge style work. The app lists dragging points as a core way to explore: move a point and the rest of the construction responds, so you can test which properties hold when a shape changes.

Measuring and transforming shapes

Lengths and areas can be measured directly on the figure. For changing a shape, the app mirrors, rotates and dilates objects, which lets you compare an original figure with its image under each transformation. These tools sit alongside the construction tools, so a transformed shape can be built from the same points.

Conics, locus lines and construction steps

For more advanced work, the app offers conics and locus lines, the paths traced by a point that moves under a rule. The developer also lists a way to investigate the steps behind a construction, so you can see how a finished figure was assembled rather than only the end result. That is useful when following someone else's construction or checking your own.

Finding activities and saving or sharing work

The app includes a search for free learning activities, so you can find ready-made exercises without leaving the app. Finished constructions can be saved and shared with others, which is how a figure gets sent to a classmate or a teacher. The listing gives Twitter and an email address for questions and feedback.