# Planes in three dimensions

## ...and points

Specify any four numbers $$a, b, c, d$$ and view the plane with equation $$ax + by + cz = d$$. You can also specify two points $$P$$ and $$Q$$, with options to draw a normal vector $$\vec{n}$$ to the plane based at $$P$$ (this only looks good if $$P$$ is chosen to be on the plane) and the vector from $$P$$ to $$Q$$. Additionally, you can alter the range of variables $$x, y, z$$.

Click the Activate'' button. If you change any of the entries or check/uncheck any boxes, you'll need to click the Update'' button to see the changes.