簡介

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 via https://help.geogebra.org