GeoGebra Geometry

GeoGebra Geometry 6.0

Free
Construct triangles, drag points, draw parallel lines, and intersect circles.
 
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GeoGebra Geometry lets you easily construct triangles, drag points, draw parallel lines, intersect circles, and save and share your results. You can create constructions with points, lines, circles, polygons, and angles. You can explore interactive geometry by dragging points, measure lengths and areas, transform shapes by mirroring, rotating and dilating them, and try advanced constructions with conics and locus lines.

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