A free program for Android, by GeoGebra.
Create triangles quickly by dragging points, drawing parallel lines, intersecting circles, saving your work, and sharing it. GeoGebra is used by millions of people worldwide to learn science and math.
This app helps you build things out of points, lines, circles, polygons, and angles. You can easily drag points to view interactive geometry and calculate distances and areas. Moreover, you also have the option to dilate, rotate, and mirror shapes to change their appearance. Once done, just save and distribute the outcomes to others.
You can also contact them with any comments or questions at support@geogebra.org or on Twitter at @geogebra.
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