GeoGebra Geometry

This is a really neat app but could use just a couple of refinements to make it great. The most important being an Undo button. Also, clear on screen instructions for tools. Took me ages of screen mashing to figure out how to make the tangent tool work.

Really easy to use, free from ads, fun app for mastering simple 2D geometry or assisting with trig class / homework or just investigating geometry/ies and seeing whats involved in constructing them. You can make MAD, glorious interdependent structures like a walking spider say if one circle is made saying make a circle passing through 3 points. If 2 of those points you pick to do that are one edge of a triangle you can quickly see how moving a single point or two brings it all to life. Hopefully it can expand further into CGeom / CGAL territory - but this keeps it simple enough a child can do it, while being flexible and powerful. Measure any angle length etc any, lists the steps to recreate your form.

Really pleased to see all the new tools being added to make it more like the desktop version.

然件非常好用，但能不能在几何区增加一个数据的处理功能，如角与角的和等，谢谢

不会用

我想用滑动条旋转一个角，就是一度一度的转，但是我那里滑动条只显示数字，都不能搞度数的。我下这个就是能够更好的理解数学题，结果你连转角度都不行

①极轴捕捉 ②画等长线段 ③画等角

怎么找轨迹

怎么保存图像

希望开发出保存功能，可以存储画好的图就完美了