I would like to visualize planes in 3D as I start learning linear algebra, to build a solid foundation. Surprisingly, I have been unable to find an online tool (website/web app) to visualize planes in 3 dimensions. For example, I'd like to be able to enter 3 points and see the plane.
Does something like this exist?
Best Answer
A great site is GeoGebra. It starts in 2D by default, but you can click on a settings button on the right to open a 3D viewer. You can add a point anywhere on the page then double-click it to set its coördinates. There are many tools, including drawing the plane determined by three given points. One of the pleasures of this site is that you can drag any of the points and it will dynamically adjust the objects you have created (so dragging a point will move the corresponding plane).
Here is a screenshot of the plane through $(3,0,0),(0,2,0)$, and $(0,0,4)$:
$\hskip2cm$