What it does: GeoGebra combines dynamic geometry, algebra, graphing and 3D mathematics. Students can construct figures, drag points and examine how measurements and equations respond.
Who it is for: Teachers who want students to investigate relationships in geometry, algebra or calculus rather than only look at a finished diagram.
Try it in a lesson: Construct a triangle and measure its interior angles. Drag its vertices, record several cases, and ask students to explain why the angle sum stays constant. Follow the investigation with a proof: dragging a figure gives evidence, not a proof by itself.
Critical-thinking move: Have students state a conjecture, try to break it by changing the construction, and explain the conditions under which it holds. Compare a figure that is merely drawn to look correct with one built using geometric constraints.
Before you use it: Match the calculator or app to the task; the full suite can present more controls than a short lesson needs. Check district account and sharing requirements. GeoGebra’s licensing distinguishes non-commercial classroom use from commercial use.
Official source: www.geogebra.org
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