1. Click to see points A, P, and R;[br]2. Click to see vectors OA (a), AP (u), PR (v) and OR (r);[br]3. Click to see the normal vector n;[br]4. Click to see the Cartesian equation of the plane;[br]5. Move the sliders for lambda and mew to see different points R(x, y, z) in the plane