Easily construct triangles drag points draw parallel lines intersect circles save and share your results. Millions of people around the world use GeoGebra to learn mathematics and science. Join us!

• Create constructions with points lines circles polygons and angles
• Explore interactive geometry by dragging points
• Measure lengths and areas
• Transform shapes by mirroring rotating and dilating them
• Try advanced constructions with conics and locus lines
• Investigate construction steps to get deeper understanding
• Search for free learning activities directly from our app
• Save and share your results with others

We’d love to hear from you: send us your questions or feedback via Twitter @geogebra or to [email protected]